#\#CIF_2.0
# Created by the Bilbao Crystallographic Server
# http://www.cryst.ehu.es
# Date: 11/22/2022

data_5yOhtAoR
_audit_creation_date            2022-11-22
_audit_creation_method          "Bilbao Crystallographic Server"

_chemical_name_systematic
;
;
_chemical_name_common                    ?
_chemical_formula_moiety                 ?
_chemical_formula_structural             ?
_chemical_formula_analytical             ?
_chemical_formula_iupac                  ?
_chemical_formula_sum                    "Er2 Ge2 O7"
_chemical_formula_weight                 ?
_chemical_melting_point                  ?
_chemical_compound_source                ?
_chemical_absolute_configuration         ?


_citation_journal_abbrev        "PHYSICAL REVIEW B"
_citation_journal_volume        101
_citation_page_first            .
_citation_page_last             .
_citation_article_id            014420
_citation_year                  2020
_citation_DOI                   10.1103/PhysRevB.101.014420

loop_
_citation_author_name
"D. M. Pajerowski"
"K. M. Taddei"
"L. D. Sanjeewa"
"A. T. Savici"
"M. B. Stone"
"J. W. Kolis"

_temperature_position_structure         0.5
_temperature_atom_positions             .
_temperature_non-magn_atom_positions    .
_temperature_cell_parameters            .

_atomic_positions_source_database_code_ICSD  19241
_atomic_positions_source_other               .

_transition_temperature     1.15
_experiment_temperature     0.1

loop_
_irrep_id
_irrep_dimension
_irrep_small_dimension
_irrep_direction_type
_irrep_action
_irrep_modes_number
_irrep_presence
mGM2  1  1  .  primary  3  .

_exptl_crystal_magnetic_properties_details
;
NPD
Positional structure from a determination at 0.5K by another work and retrieved from the ICSD
;

_active_magnetic_irreps_details
;
1k magnetic structure
k-maximal magnetic symmetry
1-dim irrep as primary
;

_parent_space_group.name_H-M_alt  'P 4_1 2_1 2'
_parent_space_group.IT_number                       92
_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  'a,b,c;0,0,0'

_space_group_magn.number_BNS  92.113
_space_group_magn.name_BNS  "P 4_1' 2_1 2'"
_space_group_magn.point_group_name  "4'22'"
_space_group_magn.point_group_number  "12.3.42"
_cell_length_a                 6.78260
_cell_length_b                 6.78260
_cell_length_c                 12.33170
_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+3/4,+1 
3 -x+1/2,y+1/2,-z+1/4,+1 
4 -x,-y,z+1/2,+1 
5 -y+1/2,x+1/2,z+1/4,-1 
6 y+1/2,-x+1/2,z+3/4,-1 
7 y,x,-z,-1 
8 -y,-x,-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
Er1 Er 0.87430 0.35450 0.13600 1
Ge1 Ge 0.90080 0.15080 0.61810 1
O1 O 0.30280 0.30280 0.00000 1
O2 O 0.07440 0.96820 0.62470 1
O3 O 0.06630 0.33710 0.57190 1
O4 O 0.68390 0.14580 0.54560 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
_atom_site_moment.spherical_azimuthal
_atom_site_moment.spherical_polar
Er1 2.15 3.11 -8.52 mx,my,mz 9.32 ? ?

