Research/Sitter/MAGNDATA / 1.107_Sm2CuO4.mcif

Sm₂CuO₄

MAGNDATA entry 1.107 · source

antiferromagnet

No net magnetisation, and up and down sublattices are related by a shift or by inversion, so the bands stay spin-degenerate: a conventional antiferromagnet.

Spin group ¹m¹m¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 280 K (7 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C_A m c a BNS 64.480
Point group	mmm1′
Parent space group	I 4/m m m No. 139
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/2 1/2 0] 1k
Cell	a 7.8292 · b 7.8292 · c 11.972 Å · α 90° · β 90° · γ 90°
Transition	280 K (7 °C)
Magnetic ions	Cu
Largest moment component	0.27 μ_B
Method	NSD

Symmetry

Stereogram of the magnetic point group: each operation applied to one direction. Filled = upper hemisphere, ring = lower; red operations include time reversal. Lines are mirrors; polygons are 2/3/4/6-fold axes; the centre ring is inversion.

Every structure in C_A m c a →

Atom sites · 4 sites · CSV

site	element	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Sm1	Sm	0	0.351
Cu1	Cu	0	0	−0.27	0.27	0	0.3818
O1	O	0.25	0
O2	O	0.25	0.25

Moment components are along the crystal axes a, b, c (μ_B), as magCIF writes them. Symmetry generates the rest of the cell from these sites.

Source

S. Skanthakumar et al. J. Appl. Phys. (1991) · doi:10.1063/1.348206

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.107_Sm2CuO4.mcif from MAGNDATA · entry page

sha256 of this copy: d36f039d8658b5224f1ef828c99b0200a846a10051bf1ac22a49674445de784f
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.107_Sm2CuO4.mcif.