#\#CIF_2.0
# Created by the Bilbao Crystallographic Server
# http://www.cryst.ehu.es
# Date: 18/05/2019


data_5yOhtAoR
_audit_creation_date            2019-05-18
_audit_creation_method          "Bilbao Crystallographic Server"

_citation_journal_abbrev        "Phys. Rev Let."
_citation_journal_volume        122
_citation_page_first            ?
_citation_page_last             ?
_citation_article_id            197203
_citation_year                  2019
_citation_DOI                   10.1103/PhysRevLett.122.197203

loop_
_citation_author_name
"S. Wu"
"W. Phelan"
"L. Liu"
"J. Morey"
"J. Tutmaher"
"J. Neuefeind"
"A. Huq"
"M.B. Stone"
"M. Feygenson"
"D.W. Tam"
"B.A. Frandsen"
"B. Trump"
"C. Wan"
"S. Dunsiger"
"T. McQueen"
"Y. Uemura"
"C. Broholm"




_atomic_positions_source_database_code_ICSD  .
_atomic_positions_source_other               .

_transition_temperature  7.6
_experiment_temperature  2

loop_
_irrep_id
_irrep_dimension
_irrep_small_dimension
_irrep_direction_type
_irrep_action
_irrep_modes_number
_irrep_presence
mX1  4  2  special  primary  1  .
mX2  8  4  special  secondary 2 .

_exptl_crystal_magnetic_properties_details
;
NPD
muon spin rotation spectroscopy
Between 8.7 and 7.6K, above this phase, an incommensurate magnetic structure with only mX2 involved is reported
;

_active_magnetic_irreps_details
;
1k magnetic structure
2 multi-dimensional irreps active
It seems that not all possible much simpler spin arrangements compatible with a single irrep or with both were checked and constrasted with the experimental data. Apparently, the degrees of freedom allowed by the possible combination of the irrep independent spin basis functions were not considered.
;

_parent_space_group.name_H-M_alt  'P 4/n m m'
_parent_space_group.IT_number                       129
_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 0]

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



_space_group_magn.number_BNS  4.10
_space_group_magn.name_BNS  "P_a 2_1"
_cell_length_a             8.12420
_cell_length_b             4.06210
_cell_length_c             8.10580
_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+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
Ce1 Ce 0.12500 0.25000 0.14710
Ni1 Ni 0.37500 0.25000 0.50000
As1 As 0.12500 0.25000 0.64390
O1 O 0.37500 0.25000 0.00000

loop_
_atom_site_moment.label
_atom_site_moment.crystalaxis_x
_atom_site_moment.crystalaxis_y
_atom_site_moment.crystalaxis_z
_atom_site_moment.symmform
Ce1 0.30 -0.22 0.00000 mx,my,mz
