#\#CIF_2.0
# Created by the Bilbao Crystallographic Server
# http://www.cryst.ehu.es
# Date: 25/10/2020

data_5yOhtAoR
_audit_creation_date            2020-10-25
_audit_creation_method          "Bilbao Crystallographic Server"

_citation_journal_abbrev        "Journal of Alloys and Compounds"
_citation_journal_volume        486
_citation_page_first            497
_citation_page_last             500
_citation_article_id            ?
_citation_year                  2009
_citation_DOI                   10.1016/j.jallcom.2009.06.191

loop_
_citation_author_name
"A. Morozkin"
"O. Isnard"
"R. Nirmala"
"S. Malik"



_atomic_positions_source_database_code_ICSD  .
_atomic_positions_source_other               .

_transition_temperature  5
_experiment_temperature  2

loop_
_irrep_id
_irrep_dimension
_irrep_small_dimension
_irrep_direction_type
_irrep_action
_irrep_modes_number
_irrep_presence
mGM3  2  2  special  primary  2  .
mGM1  1  1     .     secondary 1  yes

_exptl_crystal_magnetic_properties_details
;
NPD
Two magnetic transitions at 12K and 6K are observed.
;

_active_magnetic_irreps_details
;
1k magnetic structure
2-dim irrep along a special direction as primary
A secondary 1-dim irrep is allowed and is involved in the proposed spin arrangement
This collinear arrangement of this model requires a very specific combination of spin modes corresponding to the primary irrep with the one associated with the secondary irrep mGM1, which keeps the cubic symmetry. This is very unusual.
Apparently models corresponding to single irrep order parameters were not considered and/or checked.
;

_parent_space_group.name_H-M_alt  'I -4 3 d'
_parent_space_group.IT_number                       220
_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]

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



_space_group_magn.number_BNS  122.333
_space_group_magn.name_BNS  "I -4 2 d"
_cell_length_a             9.127
_cell_length_b             9.127
_cell_length_c             9.127
_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+1/2,y,-z,+1
3 x+1/2,-y+1/2,-z,+1
4 -x,-y+1/2,z,+1
5 y+3/4,-x+1/4,-z+3/4,+1
6 -y+1/4,x+1/4,-z+3/4,+1
7 y+1/4,x+1/4,z+1/4,+1
8 -y+3/4,-x+1/4,z+1/4,+1

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

loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Ce1 Ce 0.57000 0.57000 0.57000
Ge1_1 Ge 0.37500 0.00000 0.25000
Ge1_2 Ge  0.00000 0.25000 0.37500

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
Ce1 0.00000 0.00000 1.55(4) mx,my,mz 1.55(4)


