def test_symbolic_fourier_components(self):
m = Sample()
load_xsf(m, os.path.join(self._stdir,'crys.xsf'))
rand_k = np.random.rand(3)
rand_real_fc = np.random.rand(3).reshape((1,3))+0.j # make array complex
mm = MM(1)
mm.k=np.array(rand_k)
mm.fc_set(rand_real_fc)
m.mm = mm
m.add_muon([0.1,0.1,0.1])
r = locfield(m, 's',[10,10,10],40)[0]
if have_sympy:
smm = SMM(1,"x,y,z")
smm.k=np.array(rand_k)
smm.set_symFC("[[x,y,z]]")
smm.set_params(rand_real_fc[0].real.tolist())
m.mm = smm
r2 = locfield(m, 's',[10,10,10],40)[0]
self.assertAlmostEqual( r.D[0], r2.D[0], places=10, msg=None, delta=None)
self.assertAlmostEqual( r.D[1], r2.D[1], places=10, msg=None, delta=None)
self.assertAlmostEqual( r.D[2], r2.D[2], places=7, msg=None, delta=None)
def test_mcif(self):
m = Sample()
load_mcif(m, os.path.join(self._stdir, 'Cd2Os2O7.mcif'))
m.add_muon([float(x) for x in '0.125 0.125 0.125'.split()])
# distance is l(Os1-H) = 2.20122(0) Å
r1 = locfield(m, 's', [1, 1, 1], 2.3, 4, 2.3)
r1[0].ACont = 1.
# total field is 0
np.testing.assert_array_almost_equal(r1[0].T, np.zeros(3), decimal=7)
# distance to nnn is l(Os1-H) = 5.53962(0) Å
r1 = locfield(m, 's', [3, 3, 3], 5.54, 4, 2.3)
r1[0].ACont = 1.
# total field is 0
np.testing.assert_array_almost_equal(r1[0].T, np.zeros(3), decimal=7)
# now use a funny cell
r1 = locfield(m, 's', [
np.random.randint(3, 10),
np.random.randint(3, 10),
np.random.randint(3, 10)
], 5.54, 4, 2.3)
r1[0].ACont = 1.
# total field is 0
np.testing.assert_array_almost_equal(r1[0].T, np.zeros(3), decimal=7)
def test_mcif(self):
m = Sample()
load_mcif(m, os.path.join(self._stdir,'Cd2Os2O7.mcif'))
m.add_muon([ float(x) for x in '0.125 0.125 0.125'.split() ])
# distance is l(Os1-H) = 2.20122(0) Å
r1 = locfield(m, 's',[1,1,1],2.3,4,2.3)
r1[0].ACont = 1.
# total field is 0
np.testing.assert_array_almost_equal(r1[0].T,np.zeros(3),decimal=7)
# distance to nnn is l(Os1-H) = 5.53962(0) Å
r1 = locfield(m, 's',[3,3,3],5.54,4,2.3)
r1[0].ACont = 1.
# total field is 0
np.testing.assert_array_almost_equal(r1[0].T,np.zeros(3),decimal=7)
# now use a funny cell
r1 = locfield(m, 's',[np.random.randint(3,10),np.random.randint(3,10),np.random.randint(3,10)],5.54,4,2.3)
r1[0].ACont = 1.
# total field is 0
np.testing.assert_array_almost_equal(r1[0].T,np.zeros(3),decimal=7)
def test_compare_ass_and_rass(self):
m = Sample()
load_xsf(m, os.path.join(self._stdir, 'crys2.xsf'))
mm = MM(9)
mm.k = np.array(np.random.rand(3))
mm.fc_set(
(np.random.rand(27) + 1.j * np.random.rand(27)).reshape(9, 3))
m.mm = mm
m.add_muon(np.random.rand(3))
m.add_muon(np.random.rand(3))
r1 = locfield(m, 's', [10, 10, 10], 20)
r2 = locfield(m, 'r', [10, 10, 10], 20, axis=[1, 1, 1], nangles=1)
r1[0].ACont = 1.0
r2[0].ACont = 1.0
r1[1].ACont = 1.0
r2[1].ACont = 1.0
min_oom = min(self.oom(r1[0].T), self.oom(r2[0].T[0]))
np.testing.assert_array_almost_equal(r1[0].T,
r2[0].T[0],
decimal=6 - min_oom)
min_oom = min(self.oom(r1[1].T), self.oom(r2[1].T[0]))
np.testing.assert_array_almost_equal(r1[1].T,
r2[1].T[0],
decimal=6 - min_oom)
def test_double_moment(self):
m = Sample()
load_xsf(m, os.path.join(self._stdir, 'crys.xsf'))
mm = MM(1)
mm.k = np.array([0., 0., 0.])
mm.fc_set(np.array([[0. + 0j, 0., 1. + 0.j]]))
m.mm = mm
m.add_muon([0.1, 0.1, 0.1])
r = locfield(m, 's', [1, 1, 1], 4)[0]
m.mm.fc_set(np.array([[0. + 0j, 0. + 0.j, 2. + 0.j]]))
r2 = locfield(m, 's', [1, 1, 1], 4)[0]
# r should be: [0 tesla, 11.4226 milliteslas, 11.4226 milliteslas]
#
# (magnetic_constant/4pi)⋅((1/(1angstrom⋅sqrt(2.5^2+2.5^2+2.5^2)))^3)⋅(3⋅(1 bohr_magneton)⋅cos(atan(sqrt(2)))⋅([1,1,1]/sqrt(3))−1bohr_magneton⋅[1,0,0])
#
#
self.assertAlmostEqual(r.D[0],
0.5 * r2.D[0],
places=10,
msg=None,
delta=None)
self.assertAlmostEqual(r.D[1],
0.5 * r2.D[1],
places=10,
msg=None,
delta=None)
self.assertAlmostEqual(r.D[2],
0.5 * r2.D[2],
places=7,
msg=None,
delta=None)
def test_compare_rass_and_incass(self):
m = Sample()
load_xsf(m, os.path.join(self._stdir,'crys.xsf'))
mm = MM(1)
# define three orthogonal vectors
rp1 = np.random.rand(3) # used for k
r2 = np.random.rand(3)
rp2 = np.cross(rp1,r2)
rp3 = np.cross(rp1,rp2)
# normalize a and b vectors
rp2 /= np.linalg.norm(rp2)
rp3 /= np.linalg.norm(rp3)
#chose a random value for stag moment
stm = np.random.ranf()*10.
rp2 *= stm
rp3 *= stm
mm.k=np.array(rp1)
mm.fc_set((rp2+1.j*rp3).reshape(1,3))
m.mm = mm
m.add_muon(np.random.rand(3))
m.add_muon(np.random.rand(3))
r1 = locfield(m, 's',[50,50,50],50)
r2 = locfield(m, 'r',[50,50,50],50,nangles=1200,axis=rp1)
r3 = locfield(m, 'i',[50,50,50],50,nangles=1200)
r1[0].ACont = 1.0
r2[0].ACont = 1.0
r3[0].ACont = 1.0
r1[1].ACont = 1.0
r2[1].ACont = 1.0
r3[1].ACont = 1.0
min_oom = min(self.oom(r1[0].T), self.oom(r2[0].T[0]))
np.testing.assert_array_almost_equal(r1[0].T,r2[0].T[0],decimal=7-min_oom)
min_oom = min(self.oom(r1[1].T), self.oom(r2[1].T[0]))
np.testing.assert_array_almost_equal(r1[1].T,r2[1].T[0],decimal=7-min_oom)
r2_norms = np.apply_along_axis(np.linalg.norm, 1, r2[0].D)
r3_norms = np.apply_along_axis(np.linalg.norm, 1, r3[0].D)
min_oom=min(self.oom(np.max(r2_norms)), self.oom(np.max(r3_norms)))
np.testing.assert_array_almost_equal(np.max(r2_norms),np.max(r3_norms),decimal=4-min_oom)
min_oom=min(self.oom(np.min(r2_norms)), self.oom(np.min(r3_norms)))
np.testing.assert_array_almost_equal(np.min(r2_norms),np.min(r3_norms),decimal=4-min_oom)
r2_norms = np.apply_along_axis(np.linalg.norm, 1, r2[1].T)
r3_norms = np.apply_along_axis(np.linalg.norm, 1, r3[1].T)
min_oom=min(self.oom(np.max(r2_norms)), self.oom(np.max(r3_norms)))
np.testing.assert_array_almost_equal(np.max(r2_norms),np.max(r2_norms),decimal=5-min_oom)
min_oom=min(self.oom(np.min(r2_norms)), self.oom(np.min(r3_norms)))
np.testing.assert_array_almost_equal(np.min(r3_norms),np.min(r3_norms),decimal=5-min_oom)
def test_rotation(self):
m = Sample()
load_xsf(m, os.path.join(self._stdir,'crys3.xsf'))
mm = MM(1)
mm.k=np.array([0.,0.,0.])
mm.fc_set(np.array([[0.+0j,1.+0.j,0.+0.j]]))
m.mm = mm
m.add_muon([0.0,0.001,0.0])
r = locfield(m, 'r',[1,1,1],1.2,nnn=0,nangles=300,axis=[1,0,0])[0]
# r for angle = 0 should be: [0 T, 1.8548 T, 0 T]
#
# (magnetic_constant/4pi)⋅((1/(1angstrom⋅sqrt(1^2)))^3)⋅(3⋅(1 bohr_magneton)⋅cos(0)⋅([0,1,0]/sqrt(1))−1bohr_magneton⋅[0,1,0])
#
#
# r for angle = 90 should be: [0 T, 0 T, −0.927401 T]
#
# (magnetic_constant/4pi)⋅((1/(1angstrom⋅sqrt(1^2)))^3)⋅(3⋅(1 bohr_magneton)⋅cos(pi/2)⋅([0,1,0]/sqrt(1))−1bohr_magneton⋅[0,0,1])
#
# Opposite moments produce opposite fields. 150 is half of 300
np.testing.assert_array_almost_equal(r.D[0],-r.D[150],decimal=7)
np.testing.assert_array_almost_equal(r.D[0],np.array([0., 1.8548018,0.]),decimal=7)
np.testing.assert_array_almost_equal(r.D[75],np.array([0., 0,-0.9274009]),decimal=6)
rnorms = np.apply_along_axis(np.linalg.norm,1,r.T-r.L)
self.assertAlmostEqual( np.min(rnorms), 0.9274009 ,places=6, msg=None, delta=None)
self.assertAlmostEqual( np.max(rnorms), 1.8548018 ,places=6, msg=None, delta=None)
r = locfield(m, 'r',[5,1,1],1.5,nnn=0,nangles=300,axis=[1,0,0])[0]
np.testing.assert_array_almost_equal(r.D[0],-r.D[150],decimal=7)
np.testing.assert_array_almost_equal(r.D[0],np.array([0., 2.18268753,0.]),decimal=7)
np.testing.assert_array_almost_equal(r.D[75],np.array([0., 0,-1.58317237]),decimal=6)
rnorms = np.apply_along_axis(np.linalg.norm,1,r.T-r.L)
self.assertAlmostEqual( np.min(rnorms), 1.58317237 ,places=6, msg=None, delta=None)
self.assertAlmostEqual( np.max(rnorms), 2.18268753 ,places=6, msg=None, delta=None)
# Now test incomm
mm = MM(1)
mm.k=np.array([0.,0.,0.])
mm.fc_set(np.array([[0.+0j,1.+0.j,0.+1.j]]))
m.mm = mm
i = locfield(m, 'i',[1,1,1],1.2,nnn=0,nangles=300)[0]
inorms = np.apply_along_axis(np.linalg.norm,1,i.T-i.L)
self.assertAlmostEqual( np.min(inorms), 0.9274009 ,places=6, msg=None, delta=None)
self.assertAlmostEqual( np.max(inorms), 1.8548018 ,places=6, msg=None, delta=None)
i = locfield(m, 'i',[5,1,1],1.5,nnn=0,nangles=300)[0]
rnorms = np.apply_along_axis(np.linalg.norm,1,i.T-i.L)
self.assertAlmostEqual( np.min(rnorms), 1.58317237 ,places=6, msg=None, delta=None)
self.assertAlmostEqual( np.max(rnorms), 2.18268753 ,places=6, msg=None, delta=None)
def test_mcif3(self):
m = Sample()
load_mcif(m, os.path.join(self._stdir,'LiFeSO4F.mcif'))
muon_set_frac(m, '0.25 0.25 0.25')
# symmetry null
r1 = locfield(m, 's',[np.random.randint(10,14),np.random.randint(10,14),np.random.randint(10,14)],22,4,10.)
r1[0].ACont = 1.
# total field is 0
np.testing.assert_array_almost_equal(r1[0].T,np.zeros(3),decimal=7)
muon_reset(m)
m.add_muon([float(x) for x in '0.15990 0.17820 0.14580'.split()]) # position of O3
# one atom, distance is 2.14251 AA
# dipolar field should be:
#
# def bfield(r,m):
# return 0.9274009*(3*r*np.dot(r,m)/(np.linalg.norm(r)**5)-m/(np.linalg.norm(r)**3))
# bfield(np.array([1.07574,1.59328,0.945826]),np.array([-1.70376,3.14961,-1.22045]))
#
r1 = locfield(m, 's',[np.random.randint(1,4),np.random.randint(1,4),np.random.randint(1,4)],2.2,1,2.14251+20.*np.random.ranf())
r1[0].ACont = 1.
np.testing.assert_array_almost_equal(r1[0].D,np.array([0.29531083, -0.09756855, 0.23347458]),decimal=6)
# contact field is (2/3)⋅magnetic_constant ([-1.70376 bohr_magneton ,3.14961bohr_magneton,-1.22045bohr_magneton])⋅(1angstrom^−3) =
# [-13.2372 T, 24.4705 T, -9.48213 T]
np.testing.assert_array_almost_equal(r1[0].C,np.array([-13.2372 , 24.4705 , -9.48213]),decimal=4)
r2 = locfield(m, 's',[np.random.randint(3,5),np.random.randint(3,5),np.random.randint(3,5)],4.2,3,5.+20.*np.random.ranf())
r2[0].ACont = 1.14299 # effective interaction increased since more nnn involved in acont
# still only 14% more
# three atoms, distances are 2.14251 AA, 4.191093 AA, 4.19413AA
#
# bfield(np.array([1.07574,1.59328,0.945826]),np.array([-1.70376,3.14961,-1.22045])) + \
# bfield(np.array([2.14396,2.77751,-2.29775]),np.array([1.70376,-3.14961,1.22045])) + \
# bfield(np.array([-2.28034,-2.66189,-2.29775]),np.array([1.70376,-3.14961,1.22045]))
np.testing.assert_array_almost_equal(r2[0].D,np.array([ 0.20781014, -0.07504131, 0.23329355]),decimal=6)
def test_double_moment(self):
m = Sample()
load_xsf(m, os.path.join(self._stdir,'crys.xsf'))
mm = MM(1)
mm.k=np.array([0.,0.,0.])
mm.fc_set(np.array([[0.+0j,0.,1.+0.j]]))
m.mm = mm
m.add_muon([0.1,0.1,0.1])
r = locfield(m, 's',[1,1,1],4)[0]
m.mm.fc_set(np.array([[0.+0j,0.+0.j,2.+0.j]]))
r2 = locfield(m, 's',[1,1,1],4)[0]
# r should be: [0 tesla, 11.4226 milliteslas, 11.4226 milliteslas]
#
# (magnetic_constant/4pi)⋅((1/(1angstrom⋅sqrt(2.5^2+2.5^2+2.5^2)))^3)⋅(3⋅(1 bohr_magneton)⋅cos(atan(sqrt(2)))⋅([1,1,1]/sqrt(3))−1bohr_magneton⋅[1,0,0])
#
#
self.assertAlmostEqual( r.D[0], 0.5*r2.D[0], places=10, msg=None, delta=None)
self.assertAlmostEqual( r.D[1], 0.5*r2.D[1], places=10, msg=None, delta=None)
self.assertAlmostEqual( r.D[2], 0.5*r2.D[2], places=7, msg=None, delta=None)
def test_symbolic_fourier_components(self):
m = Sample()
load_xsf(m, os.path.join(self._stdir, 'crys.xsf'))
rand_k = np.random.rand(3)
rand_real_fc = np.random.rand(3).reshape(
(1, 3)) + 0.j # make array complex
mm = MM(1)
mm.k = np.array(rand_k)
mm.fc_set(rand_real_fc)
m.mm = mm
m.add_muon([0.1, 0.1, 0.1])
r = locfield(m, 's', [10, 10, 10], 40)[0]
if have_sympy:
smm = SMM(1, "x,y,z")
smm.k = np.array(rand_k)
smm.set_symFC("[[x,y,z]]")
smm.set_params(rand_real_fc[0].real.tolist())
m.mm = smm
r2 = locfield(m, 's', [10, 10, 10], 40)[0]
self.assertAlmostEqual(r.D[0],
r2.D[0],
places=10,
msg=None,
delta=None)
self.assertAlmostEqual(r.D[1],
r2.D[1],
places=10,
msg=None,
delta=None)
self.assertAlmostEqual(r.D[2],
r2.D[2],
places=7,
msg=None,
delta=None)
def test_mcif2(self):
m = Sample()
load_mcif(m, os.path.join(self._stdir,'ScMnO3.mcif'))
m.add_muon( [float(x) for x in '0.66666666 0.33333333 0.25'.split()])
# No contact
r1 = locfield(m, 's',[np.random.randint(10,14),np.random.randint(10,14),np.random.randint(10,14)],22,4,0.3)
r1[0].ACont = 1.
# total field is 0
np.testing.assert_array_almost_equal(r1[0].T,np.zeros(3),decimal=7)
def test_one_dipole_outside(self):
m = Sample()
load_xsf(m, os.path.join(self._stdir, 'crys.xsf'))
mm = MM(1)
mm.k = np.array([0., 0., 0.])
mm.fc_set(np.array([[1. + 0j, 0. + 1.j, 0. + 1.j]]))
m.mm = mm
m.add_muon([0.5, 0.5, 0.5])
# the diagonal is 8.6603
r = locfield(m, 's', [1, 1, 1], 8.66 / 2.)[0]
self.assertEqual(np.sum(np.abs(r.D)), 0.)
def test_one_dipole_outside(self):
m = Sample()
load_xsf(m, os.path.join(self._stdir,'crys.xsf'))
mm = MM(1)
mm.k=np.array([0.,0.,0.])
mm.fc_set(np.array([[1.+0j,0.+1.j,0.+1.j]]))
m.mm = mm
m.add_muon([0.5,0.5,0.5])
# the diagonal is 8.6603
r = locfield(m, 's',[1,1,1],8.66/2.)[0]
self.assertEqual( np.sum(np.abs(r.D)), 0.)
def test_compare_ass_and_rass(self):
m = Sample()
load_xsf(m, os.path.join(self._stdir,'crys2.xsf'))
mm = MM(9)
mm.k=np.array(np.random.rand(3))
mm.fc_set((np.random.rand(27)+1.j*np.random.rand(27)).reshape(9,3))
m.mm = mm
m.add_muon(np.random.rand(3))
m.add_muon(np.random.rand(3))
r1 = locfield(m, 's',[10,10,10],20)
r2 = locfield(m, 'r',[10,10,10],20,axis=[1,1,1],nangles=1)
r1[0].ACont = 1.0
r2[0].ACont = 1.0
r1[1].ACont = 1.0
r2[1].ACont = 1.0
min_oom = min(self.oom(r1[0].T), self.oom(r2[0].T[0]))
np.testing.assert_array_almost_equal(r1[0].T,r2[0].T[0],decimal=6-min_oom)
min_oom = min(self.oom(r1[1].T), self.oom(r2[1].T[0]))
np.testing.assert_array_almost_equal(r1[1].T,r2[1].T[0],decimal=6-min_oom)
def test_mcif2(self):
m = Sample()
load_mcif(m, os.path.join(self._stdir, 'ScMnO3.mcif'))
m.add_muon([float(x) for x in '0.66666666 0.33333333 0.25'.split()])
# No contact
r1 = locfield(m, 's', [
np.random.randint(10, 14),
np.random.randint(10, 14),
np.random.randint(10, 14)
], 22, 4, 0.3)
r1[0].ACont = 1.
# total field is 0
np.testing.assert_array_almost_equal(r1[0].T, np.zeros(3), decimal=7)
def test_one_dipole_inside(self):
m = Sample()
load_xsf(m, os.path.join(self._stdir, 'crys.xsf'))
mm = MM(1)
mm.k = np.array([0., 0., 0.])
mm.fc_set(np.array([[1. + 0j, 0. + 0.j, 0. + 0.j]]))
m.mm = mm
m.add_muon([0.5, 0.5, 0.5])
r = locfield(m, 's', [1, 1, 1], 8.67 / 2.)[0]
# BDip should be: [0 tesla, 11.4226 milliteslas, 11.4226 milliteslas]
#
# (magnetic_constant/4pi)⋅((1/(1angstrom⋅sqrt(2.5^2+2.5^2+2.5^2)))^3)⋅(3⋅(1 bohr_magneton)⋅cos(atan(sqrt(2)))⋅([1,1,1]/sqrt(3))−1bohr_magneton⋅[1,0,0])
#
# BLor should be: [ 0.01138414 T, 0 , 0 ]
#
# 0.3333333333⋅magnetic_constant (1 bohr_magneton)/((4/3)pi(angstrom 8.67/2.)^3)
#
# BCont should be (Assuming ACont = 1 AA^-3 )
#
# (2/3)⋅magnetic_constant (1 bohr_magneton)⋅(1angstrom^−3) = 7.769376 T
#
self.assertAlmostEqual(r.D[0], 0., places=7, msg=None, delta=None)
self.assertAlmostEqual(r.D[1], r.D[2], places=10, msg=None, delta=None)
self.assertAlmostEqual(r.D[1],
11.4226e-3,
places=7,
msg=None,
delta=None)
self.assertAlmostEqual(r.L[0],
0.01138414,
places=7,
msg=None,
delta=None)
self.assertAlmostEqual(r.L[1], 0.0, places=7, msg=None, delta=None)
self.assertAlmostEqual(r.L[2], 0.0, places=7, msg=None, delta=None)
r.ACont = 1. # Ang^-3
self.assertAlmostEqual(r.C[0],
7.769376,
places=7,
msg=None,
delta=None)
self.assertAlmostEqual(r.C[1], 0.0, places=7, msg=None, delta=None)
self.assertAlmostEqual(r.C[2], 0.0, places=7, msg=None, delta=None)
def test_one_dipole_inside(self):
m = Sample()
load_xsf(m, os.path.join(self._stdir,'crys.xsf'))
mm = MM(1)
mm.k=np.array([0.,0.,0.])
mm.fc_set(np.array([[1.+0j,0.+0.j,0.+0.j]]))
m.mm = mm
m.add_muon([0.5,0.5,0.5])
r = locfield(m,'s',[1,1,1],8.67/2.)[0]
# BDip should be: [0 tesla, 11.4226 milliteslas, 11.4226 milliteslas]
#
# (magnetic_constant/4pi)⋅((1/(1angstrom⋅sqrt(2.5^2+2.5^2+2.5^2)))^3)⋅(3⋅(1 bohr_magneton)⋅cos(atan(sqrt(2)))⋅([1,1,1]/sqrt(3))−1bohr_magneton⋅[1,0,0])
#
# BLor should be: [ 0.01138414 T, 0 , 0 ]
#
# 0.3333333333⋅magnetic_constant (1 bohr_magneton)/((4/3)pi(angstrom 8.67/2.)^3)
#
# BCont should be (Assuming ACont = 1 AA^-3 )
#
# (2/3)⋅magnetic_constant (1 bohr_magneton)⋅(1angstrom^−3) = 7.769376 T
#
self.assertAlmostEqual( r.D[0], 0.,places=7, msg=None, delta=None)
self.assertAlmostEqual( r.D[1], r.D[2], places=10, msg=None, delta=None)
self.assertAlmostEqual( r.D[1], 11.4226e-3, places=7, msg=None, delta=None)
self.assertAlmostEqual( r.L[0], 0.01138414 ,places=7, msg=None, delta=None)
self.assertAlmostEqual( r.L[1], 0.0 ,places=7, msg=None, delta=None)
self.assertAlmostEqual( r.L[2], 0.0 ,places=7, msg=None, delta=None)
r.ACont = 1. # Ang^-3
self.assertAlmostEqual( r.C[0], 7.769376 ,places=7, msg=None, delta=None)
self.assertAlmostEqual( r.C[1], 0.0 ,places=7, msg=None, delta=None)
self.assertAlmostEqual( r.C[2], 0.0 ,places=7, msg=None, delta=None)
def test_locfield(self):
self.sample._reset(cell=True, muon=True, sym=True, magdefs=True)
# sample, ctype, supercellsize, radius, nnn = 2, rcont = 10.0, nangles = None, axis = None):
with self.assertRaises(TypeError):
locfield(None, None, None, None)
with self.assertRaises(TypeError):
locfield(self.sample, None, None, None)
with self.assertRaises(TypeError):
locfield(self.sample, 's', None, None)
with self.assertRaises(TypeError):
locfield(self.sample, 's', [2, 2, 2], None)
#with self.assertRaises(TypeError):
# locfield(self.sample, 's', [2,2,2], 3.)
with self.assertRaises(TypeError):
locfield(self.sample, 's', [2, 2, 2], 3., '2a')
with self.assertRaises(TypeError):
locfield(self.sample, 's', [2, 2, 2], 3., '2', '10b')
with self.assertRaises(ValueError):
locfield(self.sample, 'a', [2, 2, 2], 3.)
with self.assertRaises(ValueError):
locfield(self.sample, 'i', [2, 2, 2], 3.)
with self.assertRaises(ValueError):
locfield(self.sample, 's', [0, 2, 2], 3.)
def test_compare_rass_and_incass(self):
m = Sample()
load_xsf(m, os.path.join(self._stdir, 'crys.xsf'))
mm = MM(1)
# define three orthogonal vectors
rp1 = np.random.rand(3) # used for k
r2 = np.random.rand(3)
rp2 = np.cross(rp1, r2)
rp3 = np.cross(rp1, rp2)
# normalize a and b vectors
rp2 /= np.linalg.norm(rp2)
rp3 /= np.linalg.norm(rp3)
#chose a random value for stag moment
stm = np.random.ranf() * 10.
rp2 *= stm
rp3 *= stm
mm.k = np.array(rp1)
mm.fc_set((rp2 + 1.j * rp3).reshape(1, 3))
m.mm = mm
m.add_muon(np.random.rand(3))
m.add_muon(np.random.rand(3))
r1 = locfield(m, 's', [50, 50, 50], 50)
r2 = locfield(m, 'r', [50, 50, 50], 50, nangles=1200, axis=rp1)
r3 = locfield(m, 'i', [50, 50, 50], 50, nangles=1200)
r1[0].ACont = 1.0
r2[0].ACont = 1.0
r3[0].ACont = 1.0
r1[1].ACont = 1.0
r2[1].ACont = 1.0
r3[1].ACont = 1.0
min_oom = min(self.oom(r1[0].T), self.oom(r2[0].T[0]))
np.testing.assert_array_almost_equal(r1[0].T,
r2[0].T[0],
decimal=7 - min_oom)
min_oom = min(self.oom(r1[1].T), self.oom(r2[1].T[0]))
np.testing.assert_array_almost_equal(r1[1].T,
r2[1].T[0],
decimal=7 - min_oom)
r2_norms = np.apply_along_axis(np.linalg.norm, 1, r2[0].D)
r3_norms = np.apply_along_axis(np.linalg.norm, 1, r3[0].D)
min_oom = min(self.oom(np.max(r2_norms)), self.oom(np.max(r3_norms)))
np.testing.assert_array_almost_equal(np.max(r2_norms),
np.max(r3_norms),
decimal=4 - min_oom)
min_oom = min(self.oom(np.min(r2_norms)), self.oom(np.min(r3_norms)))
np.testing.assert_array_almost_equal(np.min(r2_norms),
np.min(r3_norms),
decimal=4 - min_oom)
r2_norms = np.apply_along_axis(np.linalg.norm, 1, r2[1].T)
r3_norms = np.apply_along_axis(np.linalg.norm, 1, r3[1].T)
min_oom = min(self.oom(np.max(r2_norms)), self.oom(np.max(r3_norms)))
np.testing.assert_array_almost_equal(np.max(r2_norms),
np.max(r2_norms),
decimal=5 - min_oom)
min_oom = min(self.oom(np.min(r2_norms)), self.oom(np.min(r3_norms)))
np.testing.assert_array_almost_equal(np.min(r3_norms),
np.min(r3_norms),
decimal=5 - min_oom)
def test_mcif3(self):
m = Sample()
load_mcif(m, os.path.join(self._stdir, 'LiFeSO4F.mcif'))
muon_set_frac(m, '0.25 0.25 0.25')
# symmetry null
r1 = locfield(m, 's', [
np.random.randint(10, 14),
np.random.randint(10, 14),
np.random.randint(10, 14)
], 22, 4, 10.)
r1[0].ACont = 1.
# total field is 0
np.testing.assert_array_almost_equal(r1[0].T, np.zeros(3), decimal=7)
muon_reset(m)
m.add_muon([float(x) for x in '0.15990 0.17820 0.14580'.split()
]) # position of O3
# one atom, distance is 2.14251 AA
# dipolar field should be:
#
# def bfield(r,m):
# return 0.9274009*(3*r*np.dot(r,m)/(np.linalg.norm(r)**5)-m/(np.linalg.norm(r)**3))
# bfield(np.array([1.07574,1.59328,0.945826]),np.array([-1.70376,3.14961,-1.22045]))
#
r1 = locfield(m, 's', [
np.random.randint(1, 4),
np.random.randint(1, 4),
np.random.randint(1, 4)
], 2.2, 1, 2.14251 + 20. * np.random.ranf())
r1[0].ACont = 1.
np.testing.assert_array_almost_equal(
r1[0].D,
np.array([0.29531083, -0.09756855, 0.23347458]),
decimal=6)
# contact field is (2/3)⋅magnetic_constant ([-1.70376 bohr_magneton ,3.14961bohr_magneton,-1.22045bohr_magneton])⋅(1angstrom^−3) =
# [-13.2372 T, 24.4705 T, -9.48213 T]
np.testing.assert_array_almost_equal(
r1[0].C, np.array([-13.2372, 24.4705, -9.48213]), decimal=4)
r2 = locfield(m, 's', [
np.random.randint(3, 5),
np.random.randint(3, 5),
np.random.randint(3, 5)
], 4.2, 3, 5. + 20. * np.random.ranf())
r2[0].ACont = 1.14299 # effective interaction increased since more nnn involved in acont
# still only 14% more
# three atoms, distances are 2.14251 AA, 4.191093 AA, 4.19413AA
#
# bfield(np.array([1.07574,1.59328,0.945826]),np.array([-1.70376,3.14961,-1.22045])) + \
# bfield(np.array([2.14396,2.77751,-2.29775]),np.array([1.70376,-3.14961,1.22045])) + \
# bfield(np.array([-2.28034,-2.66189,-2.29775]),np.array([1.70376,-3.14961,1.22045]))
np.testing.assert_array_almost_equal(
r2[0].D,
np.array([0.20781014, -0.07504131, 0.23329355]),
decimal=6)
[0.0+0.j, 0.0+0.j, -0.6+0.j], [0.0+0.j, 0.0+0.j, -0.6+0.j], # magnetic Cu
[0.0+0.j, 0.0+0.j, 0.0+0.j], [0.0+0.j, 0.0+0.j, 0.0+0.j],
[0.0+0.j, 0.0+0.j, 0.0+0.j], [0.0+0.j, 0.0+0.j, 0.0+0.j],
[0.0+0.j, 0.0+0.j, 0.0+0.j], [0.0+0.j, 0.0+0.j, 0.0+0.j],
[0.0+0.j, 0.0+0.j, 0.0+0.j], [0.0+0.j, 0.0+0.j, 0.0+0.j],
[0.0+0.j, 0.0+0.j, 0.0+0.j], [0.0+0.j, 0.0+0.j, 0.0+0.j],
[0.0+0.j, 0.0+0.j, 0.0+0.j], [0.0+0.j, 0.0+0.j, 0.0+0.j],
[0.0+0.j, 0.0+0.j, 0.0+0.j], [0.0+0.j, 0.0+0.j, 0.0+0.j],
[0.0+0.j, 0.0+0.j, 0.0+0.j], [0.0+0.j, 0.0+0.j, 0.0+0.j] ])
la2cuo4.mm.desc = 'stripe along b with k = 0'
radius=find_largest_sphere(la2cuo4,[100, 100, 100])
print("Radius: ", radius)
print("Expected answer: [ 0.0035 -0.039 -0.0131] B_dip = 0.04127550110183053 T")
show_structure(la2cuo4,visualizationTool='V')
la2cuo4.current_mm_idx=0
r=locfield(la2cuo4, 's', [100, 100, 100] ,radius)
for v in r:
print ("Calculated ",v.D, 'B_dip =',np.linalg.norm(v.D,axis=0),'T')
# save_sample(la2cuo4,path+"La2CuO4-stripe-as-fm.yaml")
#------------------------------------------------------------------------------------------------------------
#Experimental internal field at the muon B_dip+B_contact in range of 400-430 G.
# or 6MHz i.e 410 Gauss from https://www.sciencedirect.com/science/article/pii/0375960187903823
#https://link.springer.com/article/10.1007/BF02396016 and https://link.springer.com/article/10.1007/BF02060647
FC for atom 1 Fe (3 real, [3 imag]): 0.00 0.00 2.22
FC for atom 2 Fe (3 real, [3 imag]): 0.00 0.00 2.22
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
- 2.22 is the Fe experimental magnetic moment in Bohr magneton
-Both commands below can be used for visualization on interactive session with xcrysden
show_cell(fe)
show_supercell(fe,[2,2,2])
"""
radius=find_largest_sphere(fe,[100, 100, 100])
r=locfield(fe, 's', [100, 100, 100] ,radius)
"""
- The find_largest_sphere func. is an experimental function. This func. has not been thoroughly tested, see documentation.
- s is for the summation method used. For help type 'help(locfield)' on the interactive python session after the locfield must have been imported
- [100, 100, 100] defines the supercell for the calculation
- radius is the sphere radius
- All the local fied contributions are contained in r, Bdipolar in r[i].D, BLorentz in r[i].L, BContact in r[i].C, Btotal in r[i].T
- If r[i].Acont(Contact field term) is not defined r[i].C is all zero.
- For Acont and its unit, see the documentation (http://muesr.readthedocs.io/en/latest/ContactTerm.html)
"""
B_dip=np.zeros([len(fe.muons),3])
B_Lor=np.zeros([len(fe.muons),3])
def test_rotation(self):
m = Sample()
load_xsf(m, os.path.join(self._stdir, 'crys3.xsf'))
mm = MM(1)
mm.k = np.array([0., 0., 0.])
mm.fc_set(np.array([[0. + 0j, 1. + 0.j, 0. + 0.j]]))
m.mm = mm
m.add_muon([0.0, 0.001, 0.0])
r = locfield(m,
'r', [1, 1, 1],
1.2,
nnn=0,
nangles=300,
axis=[1, 0, 0])[0]
# r for angle = 0 should be: [0 T, 1.8548 T, 0 T]
#
# (magnetic_constant/4pi)⋅((1/(1angstrom⋅sqrt(1^2)))^3)⋅(3⋅(1 bohr_magneton)⋅cos(0)⋅([0,1,0]/sqrt(1))−1bohr_magneton⋅[0,1,0])
#
#
# r for angle = 90 should be: [0 T, 0 T, −0.927401 T]
#
# (magnetic_constant/4pi)⋅((1/(1angstrom⋅sqrt(1^2)))^3)⋅(3⋅(1 bohr_magneton)⋅cos(pi/2)⋅([0,1,0]/sqrt(1))−1bohr_magneton⋅[0,0,1])
#
# Opposite moments produce opposite fields. 150 is half of 300
np.testing.assert_array_almost_equal(r.D[0], -r.D[150], decimal=7)
np.testing.assert_array_almost_equal(r.D[0],
np.array([0., 1.8548018, 0.]),
decimal=7)
np.testing.assert_array_almost_equal(r.D[75],
np.array([0., 0, -0.9274009]),
decimal=6)
rnorms = np.apply_along_axis(np.linalg.norm, 1, r.T - r.L)
self.assertAlmostEqual(np.min(rnorms),
0.9274009,
places=6,
msg=None,
delta=None)
self.assertAlmostEqual(np.max(rnorms),
1.8548018,
places=6,
msg=None,
delta=None)
r = locfield(m,
'r', [5, 1, 1],
1.5,
nnn=0,
nangles=300,
axis=[1, 0, 0])[0]
np.testing.assert_array_almost_equal(r.D[0], -r.D[150], decimal=7)
np.testing.assert_array_almost_equal(r.D[0],
np.array([0., 2.18268753, 0.]),
decimal=7)
np.testing.assert_array_almost_equal(r.D[75],
np.array([0., 0, -1.58317237]),
decimal=6)
rnorms = np.apply_along_axis(np.linalg.norm, 1, r.T - r.L)
self.assertAlmostEqual(np.min(rnorms),
1.58317237,
places=6,
msg=None,
delta=None)
self.assertAlmostEqual(np.max(rnorms),
2.18268753,
places=6,
msg=None,
delta=None)
# Now test incomm
mm = MM(1)
mm.k = np.array([0., 0., 0.])
mm.fc_set(np.array([[0. + 0j, 1. + 0.j, 0. + 1.j]]))
m.mm = mm
i = locfield(m, 'i', [1, 1, 1], 1.2, nnn=0, nangles=300)[0]
inorms = np.apply_along_axis(np.linalg.norm, 1, i.T - i.L)
self.assertAlmostEqual(np.min(inorms),
0.9274009,
places=6,
msg=None,
delta=None)
self.assertAlmostEqual(np.max(inorms),
1.8548018,
places=6,
msg=None,
delta=None)
i = locfield(m, 'i', [5, 1, 1], 1.5, nnn=0, nangles=300)[0]
rnorms = np.apply_along_axis(np.linalg.norm, 1, i.T - i.L)
self.assertAlmostEqual(np.min(rnorms),
1.58317237,
places=6,
msg=None,
delta=None)
self.assertAlmostEqual(np.max(rnorms),
2.18268753,
places=6,
msg=None,
delta=None)
# set muon positions in lattice coordinates
smpl.add_muon([0.1225,0.3772,0.8679])
smpl.add_muon([0.0416,0.2500,0.9172])
smpl.add_muon([0.3901,0.2500,0.3599])
smpl.add_muon([0.8146,0.0404,0.8914])
print('Local fields at the muon sites (Tesla/Bohr Magneton):')
# calculate magnetic fields, the output is a list of LocalFields objects
# (one for each muon site) that contain information on Total, Dipolar,
# Lorentz and Fermi Contact fields (for the Contact term please read the
# documentation carefully!)
#
# The parameters of the following function are:
# sample type of calculation supercell Lorentz radius
r = locfield( smpl, 's', [100,100,100], 40)
# we report the results in T/mu_B (same as the paper cited above)
print(r[0].T/4.19, "Norm {: 0.4f}".format(np.linalg.norm(r[0].T/4.19)))
print(r[1].T/4.19, "Norm {: 0.4f}".format(np.linalg.norm(r[1].T/4.19)))
print(r[2].T/4.19, "Norm {: 0.4f}".format(np.linalg.norm(r[2].T/4.19)))
print(r[3].T/4.19, "Norm {: 0.4f}".format(np.linalg.norm(r[3].T/4.19)))
# ==== Now Automatically ====
print('Now automatic run...\n')
# create a new magnetic model for the sample
smpl.new_mm()
s.mm.k = k_rlu
s.mm.fc = RH_FCs
s.new_mm()
s.mm.desc = "Left handed spiral"
s.mm.k = k_rlu
s.mm.fc = LH_FCs
s.add_muon([0.532, 0.532, 0.532])
muon_find_equiv(s)
# For Reft Handed
s.current_mm_idx = 1; # N.B.: indexes start from 0 but idx=0 is the transverse field!
r_RH = locfield(s, 'i',[50,50,50],100,nnn=3,nangles=360)
s.current_mm_idx = 2;
r_LH = locfield(s, 'i',[50,50,50],100,nnn=3,nangles=360)
for i in range(4):
r_RH[i].ACont = -0.066
r_LH[i].ACont = -0.066
# Two subplots, unpack the axes array immediately
f, (ax1, ax2) = plt.subplots(1, 2, sharey=True, figsize=(10,5))
ax1.set_title('right-handed')
ax2.set_title('left-handed')
# according to CoF2.cif (setting with a,b equal, c shorter, type cif to check)
# H-M P4_2/mnm group 136, six atoms in the cell, in this order
# Co at 0.00000 0.00000 0.00000 (2b site)
# the symmetry replica is generated at 0.5000 0.5000 0.5000
# http://www.cryst.ehu.es/cgi-bin/cryst/programs/nph-normsets?&norgens=&gnum=136
# F at 0.30600 0.30600 0.00000 (4f site)
# the symmetry replicas are generated at 1--x 1-x 0, 0.5+x 0.5-x, 0.5, 0.5-x,0.5+x, 0.5
cof.mm.fc= np.array([[0.0+0.j, 0.0+0.j, 2.6+0.j],[0.0+0.j, 0.0+0.j, -2.6+0.j],
[0.0+0.j, 0.0+0.j, 0.0+0.j],[0.0+0.j, 0.0+0.j, 0.0+0.j],
[0.0+0.j, 0.0+0.j, 0.0+0.j],[0.0+0.j, 0.0+0.j, 0.0+0.j] ])
show_structure(cof,visualizationTool='V') # show_structure(cof,supercell=[1,1,2],visualizationTool='V')
n=18
radius=find_largest_sphere(cof,[n,n,n])
B_dip = np.linalg.norm(locfield(cof, 's', [n,n,n] ,radius)[0].D,axis=0)
print('R = {:.1f}, B_dip = {:.4f} T'.format(radius,B_dip))
npoints = 11
n = np.logspace(0.53,2,npoints,dtype=int)
k = -1
B_dip = np.zeros(npoints)
R = np.zeros(npoints)
for m in n:
k += 1
radius=find_largest_sphere(cof,[m,m,m])
r=locfield(cof, 's', [m, m, m] ,radius) #
R[k] = radius
B_dip[k] =np.linalg.norm(r[0].D,axis=0)
fig,ax = P.subplots()
ax.plot(R,B_dip,'bo',label='sum')
ax.plot(R,R-R+0.265,'b--',label='exp')
def test_locfield(self):
self.sample._reset(cell=True,muon=True,sym=True,magdefs=True)
# sample, ctype, supercellsize, radius, nnn = 2, rcont = 10.0, nangles = None, axis = None):
with self.assertRaises(TypeError):
locfield(None, None, None, None)
with self.assertRaises(TypeError):
locfield(self.sample, None, None, None)
with self.assertRaises(TypeError):
locfield(self.sample, 's', None, None)
with self.assertRaises(TypeError):
locfield(self.sample, 's', [2,2,2], None)
#with self.assertRaises(TypeError):
# locfield(self.sample, 's', [2,2,2], 3.)
with self.assertRaises(TypeError):
locfield(self.sample, 's', [2,2,2], 3., '2a')
with self.assertRaises(TypeError):
locfield(self.sample, 's', [2,2,2], 3., '2', '10b')
with self.assertRaises(ValueError):
locfield(self.sample, 'a', [2,2,2], 3.)
with self.assertRaises(ValueError):
locfield(self.sample, 'i', [2,2,2], 3.)
with self.assertRaises(ValueError):
locfield(self.sample, 's', [0,2,2], 3.)