#\#CIF_2.0
# Created by the Bilbao Crystallographic Server
# http://www.cryst.ehu.es
# Date: 11/19/2017 17:20:04
# Database entry: 2.12 TbMg
# Cif-like file for the case 2.12


data_5yOhtAoR
_audit_creation_date            2017-11-19
_audit_creation_method          "Bilbao Crystallographic Server"

_chemical_name_systematic
;
;
_chemical_name_common                    ?
_chemical_formula_moiety                 ?
_chemical_formula_structural             ?
_chemical_formula_analytical             ?
_chemical_formula_iupac                  ?
_chemical_formula_sum                    'Tb Mg'
_chemical_formula_weight                 ?
_chemical_melting_point                  ?
_chemical_compound_source                ?
_chemical_absolute_configuration         .


_citation_journal_abbrev        "Solid State Commm."
_citation_journal_volume        17
_citation_page_first            599
_citation_page_last             603
_citation_article_id            .
_citation_year                  1975
_citation_DOI                   10.1016/0038-1098(75)90544-X

loop_
_citation_author_name
"R. Aleonard"
"P. Morin"
"J. Pierre"
"D. Schmitt"




_atomic_positions_source_database_code_ICSD   104880
_atomic_positions_source_other               .

_transition_temperature     81
_experiment_temperature     4.2

loop_
_irrep_id
_irrep_dimension
_irrep_small_dimension
_irrep_direction_type
_irrep_action
_irrep_modes_number
_irrep_presence
mGM4+ 3 3 special primary 1 .
mX5+ 6 2 special-2 primary 1 .

_exptl_crystal_magnetic_properties_details
;
NPD
Two models were undistinguishable. This is the second one proposed (FyAx). See the first one in entry #2.11
A similar structure is attributed to GdMg
;

_active_magnetic_irreps_details
;
2k magnetic structure
k-maximal magnetic symmetry
The two different models include the same irreps, but with different relative orientations of their order parameters.
The mx and my components are the mX5+(k2) and mGM4+(k1) modes, respectively.
;

_parent_space_group.name_H-M_alt  'P  m  -3m'
_parent_space_group.IT_number                       221
_parent_space_group.transform_Pp_abc  'a,b,c;0,0,0'

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

_parent_space_group.child_transform_Pp_abc  'a,b,2c;0,0,0'
_space_group_magn.transform_BNS_Pp_abc  'a,b,c;0,0,0'


_space_group_magn.number_BNS  49.270
_space_group_magn.name_BNS  "P  c'  c  m'  "
_space_group_magn.point_group_name  "m'm'm"
_space_group_magn.point_group_number  "8.4.27"
_cell_length_a                 3.77800
_cell_length_b                 3.77800
_cell_length_c                 7.55600
_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,y,-z+1/2,+1
3 -x,-y,-z,+1
4 x,-y,z+1/2,+1
5 x,-y,-z+1/2,-1
6 -x,-y,z,-1
7 -x,y,z+1/2,-1
8 x,y,-z,-1

loop_
_space_group_symop_magn_centering.id
_space_group_symop_magn_centering.xyz
1 x,y,z,+1

loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Mg1 Mg 0.50000 0.50000 0.25000 1
Tb1 Tb 0.00000 0.00000 0.00000 1

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 5.18(5) 5.2(1) 0.0 mx,my,0

