Research/Sitter/MAGNDATA / 1.239_MnBr2.mcif

MnBr₂

MAGNDATA entry 1.239 · 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 ≤ 2.2 K (−271 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C_c 2/m BNS 12.63
Parent space group	P 3 m 1 No. 164
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 1/4 1/4] 1k
Cell	a 3.868 · b 13.3991 · c 25.088 Å · α 90° · β 90° · γ 90°
Transition	2.17 K (−271 °C)
Measured at	1.35 K
Magnetic ions	Mn
Largest moment component	1 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_c 2/m →

Atom sites · 3 sites · CSV

site	element	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Mn1	Mn	0	0	1	0	0	1
Br1_1	Br	0.1667	0.0625
Br1_2	Br	0.1667	0.3125

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

E.O. Wollan et al. Phys. Rev. (1958) · doi:10.1103/PhysRev.110.638

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.239_MnBr2.mcif from MAGNDATA · entry page

sha256 of this copy: 70b635f24811df49267496d61ef6f69cb0c446f1b2d0f38ea1a96d84c4667fd3
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.239_MnBr2.mcif.