#\#CIF_2.0
# Created by the Bilbao Crystallographic Server
# http://www.cryst.ehu.es
# Date: 11/14/2021

data_5yOhtAoR
_audit_creation_date            2021-11-14
_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                    "Eu2 Cu O4"
_chemical_formula_weight                 ?
_chemical_melting_point                  ?
_chemical_compound_source                ?
_chemical_absolute_configuration         ?


_citation_journal_abbrev        "Physical Review B"
_citation_journal_volume        49
_citation_page_first            9944
_citation_page_last             9948
_citation_article_id            .
_citation_year                  1994
_citation_DOI                   10.1103/physrevb.49.9944 

loop_
_citation_author_name
"T. Chattopadhyay"
"J. W. Lynn"
"N. Rosov"
"T. E. Grigereit"
"S. N. Barilo"
"D. I. Zhigunov"

_temperature_position_structure         300
_temperature_atom_positions             .
_temperature_non-magn_atom_positions    .
_temperature_cell_parameters            .

_atomic_positions_source_database_code_ICSD  72244
_atomic_positions_source_other               .

_transition_temperature     265(5)
_experiment_temperature     10

loop_
_irrep_id
_irrep_dimension
_irrep_small_dimension
_irrep_direction_type
_irrep_action
_irrep_modes_number
_irrep_presence
mX3+ 2 1 special-2 primary 1 .

_exptl_crystal_magnetic_properties_details
;
NSD
Positional structure, including unit cell parameters, is not specified. Here one determined at room temperature and retrieved from the ICSD is used.
2k structure is reported as preferable to the 1k structure, based on the results of magnetic field dependent measurements
There are two alternative physically distinct tetragonal MSGs, which are possible for this 2k structure depending on the active irrep. They correspond to the two possible senses of the rotation of spins (+pi/2 or -pi/2) in consecutive layers along the c axis. In the present case the spin arrangement is the same as the one one proposed for Sm2CuO4, i.e. same MSG, same irrep (see #2.7), but differs from that reported for Pr2CuO4 and Nd2CuO4, i.e. different MSG, different irrep (see #2.48 and #2.6).
;

_active_magnetic_irreps_details
;
2k magnetic structure
k-maximal magnetic symmetry
2-dim full irrep along a special direction
;

_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 [1/2 1/2 0]
k2 [1/2 -1/2 0]

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

_space_group_magn.number_BNS  138.529
_space_group_magn.name_BNS  "P_C 4_2/n c m"
_space_group_magn.point_group_name  "4/mmm1'"
_space_group_magn.point_group_number  "15.2.54"
_cell_length_a                 7.80240
_cell_length_b                 7.80240
_cell_length_c                 11.90300
_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 -y+1/4,x+1/4,z+1/2,+1 
3 y+3/4,-x+1/4,z+1/2,+1 
4 y+1/4,x+1/4,-z+1/2,+1 
5 -y+3/4,-x+1/4,-z+1/2,+1 
6 -x,-y+1/2,z,+1 
7 -x,y+1/2,-z,+1 
8 x,-y,-z,+1 
9 -x,-y,-z,+1 
10 y+1/4,-x+1/4,-z+1/2,+1 
11 -y+3/4,x+1/4,-z+1/2,+1 
12 -y+1/4,-x+1/4,z+1/2,+1 
13 y+3/4,x+1/4,z+1/2,+1 
14 x,y+1/2,-z,+1 
15 x,-y+1/2,z,+1 
16 -x,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+1/2,z,+1 
3 x,y+1/2,z,-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
_atom_site_occupancy
Eu1 Eu 0.00000 0.00000 0.35000 1
Cu1 Cu 0.00000 0.00000 0.00000 1
O1_1 O 0.00000 0.25000 0.00000 1
O1_2 O 0.25000 0.00000 0.00000 1
O2_1 O 0.00000 0.25000 0.25000 1
O2_2 O 0.25000 0.00000 0.25000 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
Cu1 0.4(1) 0.0 0.0 mx,0,0 0.4(1) ? ?

