Research/Sitter/MAGNDATA / 0.598_AlCr2.mcif

AlCr₂

MAGNDATA entry 0.598 · 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 ¹4/¹m¹m¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 598 K (325 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P_A 2₁/c BNS 14.83
Parent space group	I 4/m m m No. 139
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 1] 1k
Cell	a 3.006 · b 3.006 · c 8.663 Å · α 90° · β 90° · γ 90°
Transition	598 K (325 °C)
Measured at	4.2 K
Magnetic ions	Cr
Largest moment component	0.83 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 P_A 2₁/c →

Atom sites · 2 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Al1	Al	0	0	0
Cr1	Cr	0	0	0.319	0	−0.83	−0.39	0.9171

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

M. Atoji et al. J. Chem. Phys. (1965) · doi:10.1063/1.1696459

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.598_AlCr2.mcif from MAGNDATA · entry page

sha256 of this copy: 43d953b521f72deb4244dc7c4a468650fbf15631b5445d2d0e71d65888524e3b
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.598_AlCr2.mcif.