#\#CIF_2.0
# Created by the Bilbao Crystallographic Server
# http://www.cryst.ehu.es
# Date: 01/05/2020

data_5yOhtAoR
_audit_creation_date            2020-05-01
_audit_creation_method          "Bilbao Crystallographic Server"

_citation_journal_abbrev        "Journal of Magnetism and Magnetic Materials"
_citation_journal_volume        127
_citation_page_first            83
_citation_page_last             92
_citation_article_id            ?
_citation_year                  1993
_citation_DOI                   10.1016/0304-8853(93)90200-L

loop_
_citation_author_name
"G. Andre"
"F. Bouree"
"A. Bombik"
"A. Oles"
"W. Sikora"
"M. Kolenda"
"A. Szytula"



_atomic_positions_source_database_code_ICSD  57062
_atomic_positions_source_other               .

_transition_temperature  5
_experiment_temperature  1.65

loop_
_irrep_id
_irrep_dimension
_irrep_small_dimension
_irrep_direction_type
_irrep_action
_irrep_modes_number
_irrep_presence
mU1-U4-  2  2  general  primary  4  .
mU2+U3+  2  2  general  primary  4  .

_exptl_crystal_magnetic_properties_details
;
NPD
Position structure from a determination at 30K
Above around 2.2K (up to T_N) also an incommensurate spiral structure without enough specific information is reported.
;

_active_magnetic_irreps_details
;
1k magnetic structure
Two (physically irreducible) irreps are active as primary
Despite its simplicity and in contradiction with the statement in the original reference this collinear spin arrangement is of very low symmetry and cannot be explained by a single physically irreducible irrep. It requires the presence of spin modes corresponding to two different (physically irreducible) irreps. Not clear if the correct spin arrangement associated with a single (physically) irrep was checked and tested in comparison with the proposed model.
;

_parent_space_group.name_H-M_alt  'P n m a'
_parent_space_group.IT_number                       62
_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 1/2]

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



_space_group_magn.number_BNS  7.28
_space_group_magn.name_BNS  "P_c c"
_cell_length_a             13.704
_cell_length_b             4.202
_cell_length_c             14.526
_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+1/2,z+1/2,+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+1/2,+1
3 x,y,z+1/2,-1
4 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
Ho1_1 Ho 0.00000 0.25000 0.35355
Ho1_2 Ho  0.25000 0.75000 0.10355
Ho1_3 Ho  0.00000 0.75000 0.14645
Ho1_4 Ho  0.25000 0.25000 0.39645
Ni1_1 Ni 0.09725 0.25000 0.04235
Ni1_2 Ni  0.15275 0.75000 0.29235
Ni1_3 Ni  0.90275 0.75000 0.95765
Ni1_4 Ni  0.34725 0.25000 0.20765
Ge1_1 Ge 0.10220 0.25000 0.20765
Ge1_2 Ge  0.14780 0.75000 0.45765
Ge1_3 Ge  0.89780 0.75000 0.79235
Ge1_4 Ge  0.35220 0.25000 0.04235

loop_
_atom_site_moment.label
_atom_site_moment.crystalaxis_x
_atom_site_moment.crystalaxis_y
_atom_site_moment.crystalaxis_z
_atom_site_moment.symmform
Ho1_1 9.98(5) 0.00000 0.00000 mx,0,mz
Ho1_2 -9.98 0.00000 0.00000 mx,0,mz
Ho1_3 9.98 0.00000 0.00000 mx,0,mz
Ho1_4 -9.98 0.00000 0.00000 mx,0,mz

