Research/Sitter/MAGNDATA / 1.245_CoBr2.mcif

CoBr₂

MAGNDATA entry 1.245 · 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 ¹3̄¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 19 K (−254 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C_c 2/c BNS 15.90
Parent space group	P 3m 1 No. 164
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 1/2] 1k
Cell	a 3.692 · b 3.692 · c 12.264 Å · α 90° · β 90° · γ 120°
Transition	19 K (−254 °C)
Measured at	4.2 K
Magnetic ions	Co
Largest moment component	3.2 μ_B
Method	NPD, 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_c 2/c →

Atom sites · 2 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Co1	Co	0	0	0	3.2	1.6	0	2.7713
Br1	Br	0.3333	0.6667	0.125

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.K. Wilkinson et al. Phys. Rev. (1959) · doi:10.1103/PhysRev.113.497

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.245_CoBr2.mcif from MAGNDATA · entry page

sha256 of this copy: 987fcd24909d17bee13dd8616b08b90e4095b6e568de451e2edf929ea61b95db
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.245_CoBr2.mcif.