Research/Sitter/MAGNDATA / 0.110_Cr2O3.mcif

Cr₂O₃

MAGNDATA entry 0.110 · 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 ≤ 307.6 K (34 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C 2′/c BNS 15.87
Point group	2′/m
Parent space group	R 3c No. 167
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 4.957 · b 4.957 · c 13.5923 Å · α 90° · β 90° · γ 120°
Transition	307.6 K (34 °C)
Magnetic ions	Cr
Largest moment component	1 μ_B
Method	Second harmonic generation measurements

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 2′/c →

Atom sites · 3 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Cr1	Cr	0	0	0.3475	−1	0	0	1
O1_1	O	0.3057	0	0.25
O1_2	O	0	0.3057	0.25

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. Fiebig et al. PHYSICAL REVIEW B (1996) · doi:10.1103/PhysRevB.54.R12681

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.110_Cr2O3.mcif from MAGNDATA · entry page

sha256 of this copy: 31ba14a2d22fc9fde208676e2040441109b846e9a688b2699b5898607dd02ba4
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.110_Cr2O3.mcif.