#\#CIF_2.0
# Created by the Bilbao Crystallographic Server
# http://www.cryst.ehu.es
# Date: 03/28/2021

data_5yOhtAoR
_audit_creation_date            2021-03-28
_audit_creation_method          "Bilbao Crystallographic Server"

_citation_journal_abbrev        "J. Chem. Phys."
_citation_journal_volume        46
_citation_page_first            1891
_citation_page_last             ?
_citation_article_id            ?
_citation_year                  1967
_citation_DOI                   10.1063/1.1840950

loop_
_citation_author_name
"M. Atoji"

_atomic_positions_source_database_code_ICSD  17025
_atomic_positions_source_other               .

_transition_temperature     66(2)
_experiment_temperature     5

loop_
_irrep_id
_irrep_dimension
_irrep_small_dimension
_irrep_direction_type
_irrep_action
_irrep_modes_number
_irrep_presence
mSM3(k1) 4  1  special  primary  1  .
mSM4(k1) 4  1  special  primary  1  .
mSM3(3k1) 4  1  special secondary 1 no
mSM4(3k1) 4  1  special secondary 1 no

_exptl_crystal_magnetic_properties_details
;
NPD
At low temperatures (below 35-30K) a different undetermined magnetic arrangement apparently coexists with this one.
;

_active_magnetic_irreps_details
;
1k magnetic structure
Two irreps as primary: two order parameters in the sense of Landau theory are involved 
Helliptical spiral structure
The irrep star has two pairs of (k,-k) vectors. Alternative possible 2k structures involving the two pairs of the irreps star were not considered.
;

_parent_space_group.name_H-M_alt  'I 4/m m m'
_parent_space_group.IT_number             139
_parent_space_group.transform_Pp_abc  'a,b,c;0,0,0'

loop_
_parent_propagation_vector.id
_parent_propagation_vector.kxkykz
k1 [3/4 0 0]

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


_space_group_magn.number_BNS  17.12
_space_group_magn.name_BNS  "P_c 2 2 2_1"
_space_group_magn.point_group_name  "2221'"
_space_group_magn.point_group_number  "6.2.18"
_cell_length_a                 14.712
_cell_length_b                 3.678(1)
_cell_length_c                 6.206(1)
_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,-y,z,+1 
3 -x+1/2,y,-z,+1 
4 x+1/2,-y,-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
_atom_site_occupancy
Tb1_1 Tb 0.25000 0.00000 0.00000 1
Tb1_2 Tb 0.00000 0.00000 0.00000 1
Tb1_3 Tb 0.87500 0.50000 0.50000 1
C1_1 C 0.25000 0.00000 0.6040(7) 1
C1_2 C 0.00000 0.00000 0.60400 1
C1_3 C 0.87500 0.50000 0.10400 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
Tb1_1 0.0 1.6(3) 0.0 0,My,0   1.6(3)
Tb1_2 0.0 0.0 7.1(3) 0,0,Mz   7.1(3)
Tb1_3 0.0 1.13 -5.02 0,My,Mz  5.15

