#\#CIF_2.0
# Created by the Bilbao Crystallographic Server
# http://www.cryst.ehu.es
# Date: 04/24/2021 

data_5yOhtAoR
_audit_creation_date            2021-04-24
_audit_creation_method          "Bilbao Crystallographic Server"

_citation_journal_abbrev        "Philosophical Magazine"
_citation_journal_volume        10
_citation_page_first            713
_citation_page_last             721
_citation_article_id            .
_citation_year                  1964
_citation_DOI                   10.1080/14786436408228489

loop_
_citation_author_name
"J. B. Forsyth"
"C. E. Johnson"
"P. J. Brown"

_atomic_positions_source_database_code_ICSD  77313
_atomic_positions_source_other               .

_temperature_position_structure         293
_temperature_atom_positions             .              
_temperature_non-magn_atom_positions    .
_temperature_cell_parameters            .

_transition_temperature     270
_experiment_temperature     100

loop_
_irrep_id
_irrep_dimension
_irrep_small_dimension
_irrep_direction_type
_irrep_action
_irrep_modes_number
_irrep_presence
mM5+ 2 2 special primary 1 .
mGM5- 2 2 special primary 1  .

_exptl_crystal_magnetic_properties_details
;
NSD and NPD
Position structure from a determination at room temperature of another work
Angle between the two directions of the spins: 71 degrees
The absolute orientation of the moments on the basal ab plane is undetermined. An orientation of maximal symmetry is arbitrarily chosen. Another possible non-equivalent orientation is obtained rotating the spin arrangement by 45 degrees (see for instance the model proposed for FeSn2: #2.66).
;

_active_magnetic_irreps_details
;
2k magnetic structure
k-maximal symmetry
Two irreps along special directions as primary: two order parameters are involved.
See #1.557 for a rather different model of this structure, with a single order parameter (only one irrep).
;

_parent_space_group.name_H-M_alt  'I 4/m c m'
_parent_space_group.IT_number                       140
_parent_space_group.transform_Pp_abc  'a,b,c;0,0,0'

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

_parent_space_group.child_transform_Pp_abc  'a,b,c;0,0,0'
_space_group_magn.transform_BNS_Pp_abc  'a,b,c;1/4,1/4,1/4'

_space_group_magn.number_BNS  56.367
_space_group_magn.name_BNS  "P c' c n"
_space_group_magn.point_group_name  "m'mm"
_space_group_magn.point_group_number  "8.3.26"
_cell_length_a                 5.89900
_cell_length_b                 5.89900
_cell_length_c                 4.94100
_cell_angle_alpha              90.00000
_cell_angle_beta               90.00000
_cell_angle_gamma              90.00000

loop_
_space_group_symop_magn_operation.id
_space_group_symop_magn_operation.xyz
1 x,y,z,+1 
2 x+1/2,-y+1/2,-z,+1 
3 x,-y,z+1/2,+1 
4 x+1/2,y+1/2,-z+1/2,+1 
5 -x+1/2,y+1/2,-z,-1 
6 -x,-y,z,-1 
7 -x+1/2,-y+1/2,-z+1/2,-1 
8 -x,y,z+1/2,-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
Ge1_1 Ge 0.15800 0.65800 0.00000 1
Fe1_1 Fe 0.00000 0.00000 0.25000 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
_atom_site_moment.magnitude
Fe1_1 0.595 0.423 0.0 Mx,My,0  0.73(6)

