Research/Sitter/MAGNDATA / 1.893_Cs2CoBr4.mcif

Cs₂CoBr₄

MAGNDATA entry 1.893 · 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 ¹2/¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 1.3 K (−272 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P_a 2₁/c BNS 14.80
Point group	2/m1′
Parent space group	P n m a No. 62
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 1/2 1/2] 1k
Cell	a 10.1931 · b 15.45 · c 27.02 Å · α 90° · β 90° · γ 90°
Transition	1.3 K (−272 °C)
Measured at	0.1 K
Magnetic ions	Co
Largest moment component	2.44 μ_B
Method	NSD at T < 0.1 K and zero magnetic field.

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 · 7 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Cs1	Cs	0.9776	0.125	0.4142
Cs2	Cs	0.6377	0.125	0.0515
Co1	Co	0.2356	0.125	0.5389	0	−2.44	0	2.44
Br1	Br	0.002	0.125	0.0494
Br2	Br	0.3128	0.125	0.4552
Br3_1	Br	0.1742	0.2491	0.3271
Br3_2	Br	0.3258	0.7509	0.0771

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

L. Facheris et al. Phys. Rev. Lett. (2022) · doi:10.1103/PhysRevLett.129.087201

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.893_Cs2CoBr4.mcif from MAGNDATA · entry page

sha256 of this copy: 5ffcb04df595fa1dd254734358320c073937ace8811d38324873630a02d86b3c
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.893_Cs2CoBr4.mcif.