Research/Sitter/MAGNDATA / 0.58_CoAl2O4.mcif

CoAl₂O₄

MAGNDATA entry 0.58 · 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 ¹m¹3̄¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 10 K (−263 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	I 4₁′/a′ m′ d BNS 141.556
Point group	4′/m′m′m
Parent space group	F d 3m No. 227
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 8.1011 · b 8.1011 · c 8.1011 Å · α 90° · β 90° · γ 90°
Transition	10 K (−263 °C)
Magnetic ions	Co
Largest moment component	1.9 μ_B
Method	NPD

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 I 4₁′/a′ m′ d →

Atom sites · 3 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Co1	Co	0.125	0.125	0.125	0	0	1.9	1.9
Al1	Al	0.5	0.5	0.5
O1	O	0.263	0.263	0.263

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

B. Roy et al. PHYSICAL REVIEW B (2013) · doi:10.1103/physrevb.88.174415

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.58_CoAl2O4.mcif from MAGNDATA · entry page

sha256 of this copy: ebaadb52d3d7b0d3e3f84f99da86cc2dab10acf4205ee8f6f39a095e19b7c63b
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.58_CoAl2O4.mcif.