#\#CIF_2.0
# Created by the Bilbao Crystallographic Server
# http://www.cryst.ehu.es
# Date: 13/04/2020 

data_5yOhtAoR
_audit_creation_date            2020-04-13
_audit_creation_method          "Bilbao Crystallographic Server"

_citation_journal_abbrev        "J. Phys.: Condens. Matter"
_citation_journal_volume        19
_citation_page_first            ?
_citation_page_last             ?
_citation_article_id            236201
_citation_year                  2007
_citation_DOI                   1088/0953-8984/19/23/236201

loop_
_citation_author_name
"P Schobinger-Papamantellos"
"J Rodriguez-Carvajal"
"K H J Buschow"

_atomic_positions_source_database_code_ICSD  .
_atomic_positions_source_other               .

_transition_temperature  23
_experiment_temperature  8

loop_
_irrep_id
_irrep_dimension
_irrep_small_dimension
_irrep_direction_type
_irrep_action
_irrep_modes_number
_irrep_presence
mM1  4  1  special-2  primary  3  .
mSM4 2  1    .      secondary 1  yes

_exptl_crystal_magnetic_properties_details
;
NPD
Incommensurate magnetic ordering above 23K, up to 40K.
;

_active_magnetic_irreps_details
;
2k magnetic structure
k-maximal magnetic symmetry (8 possible)
The spin arrangement requires the superpositions of two modulations with symmetry-related propagation vectors (1/2,0,1/3) and (1/2,0,-1/3). The modulation with wavevector (1/2,0,0) can be considered a secondary third harmonic (it does not break further the symmetry)
The label of the magnetic space group mentioned in the reference is incorrect.
4-dim full irrep as primary. The star of the irrep has four k-vectors
A third harmonic with k2=(1/2 0 0) corresponding to a secondary irrep is present with a significant weight.
;

_parent_space_group.name_H-M_alt  'C m c m'
_parent_space_group.IT_number                       63
_parent_space_group.transform_Pp_abc  'a,b,c;0,0,0'

loop_
_parent_propagation_vector.id
_parent_propagation_vector.kxkykz
k1 [1/2 0 1/3]
k2 [1/2 0 -1/3]

_parent_space_group.child_transform_Pp_abc  '2a,b,3c;0,0,0'
_space_group_magn.transform_BNS_Pp_abc  'b,c,a;7/8,1/4,0'



_space_group_magn.number_BNS  62.452
_space_group_magn.name_BNS  "P_c n m a"
_cell_length_a             8.09400
_cell_length_b             20.80400
_cell_length_c             11.74440
_cell_angle_alpha          90.00
_cell_angle_beta           90.00
_cell_angle_gamma          90.00

loop_
_space_group_symop_magn_operation.id
_space_group_symop_magn_operation.xyz
1 x,y,z,+1 
2 -x+1/4,y+1/2,-z+1/2,+1 
3 -x+3/4,-y+1/2,z+1/2,+1 
4 x+1/2,-y,-z,+1 
5 -x+3/4,-y+1/2,-z,+1 
6 x+1/2,-y,z+1/2,+1 
7 x,y,-z+1/2,+1 
8 -x+1/4,y+1/2,z,+1 

loop_
_space_group_symop_magn_centering.id
_space_group_symop_magn_centering.xyz
1 x,y,z,+1 
2 x+1/2,y,z,-1 

loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Tb1_1 Tb 0.00000 0.41670 0.08333
Tb1_2 Tb  0.00000 0.58330 0.25000
Ge1_1 Ge 0.00000 0.03820 0.08333
Ge1_2 Ge  0.00000 0.96180 0.25000
Ge2_1 Ge 0.00000 0.69170 0.08333
Ge2_2 Ge  0.00000 0.30830 0.25000
Ge3_1 Ge 0.00000 0.80950 0.08333
Ge3_2 Ge  0.00000 0.19050 0.25000

loop_
_atom_site_moment.label
_atom_site_moment.crystalaxis_x
_atom_site_moment.crystalaxis_y
_atom_site_moment.crystalaxis_z
_atom_site_moment.symmform
Tb1_1 0.00000 0.00000 8.15(7) mx,my,mz
Tb1_2 0.00000 0.00000 -8.30(5) 0,0,mz

