Research/Sitter/MAGNDATA / 0.891_CuCr2O4.mcif

CuCr₂O₄

MAGNDATA entry 0.891 · source

noncollinear ferrimagnet

Opposite moments of different size leave a net magnetisation.

ordered ≤ 135 K (−138 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	C 2′/c′ BNS 15.89
Point group	2′/m′
Parent space group	I 4₁/a m d No. 141
Spins	coplanar · net moment 18.8 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 7.7136 · b 8.5368 · c 8.5368 Å · α 90° · β 90° · γ 90°
Transition	135 K (−138 °C)
Measured at	2 K
Magnetic ions	Cr, Cu
Largest moment component	2.07 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 C 2′/c′ →

Atom sites · 5 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Cu1	Cu	0.125	0.125	0.125	−0.85	0	0	0.85
Cr1_1	Cr	0.5	0.5	0.5	1.6	0	2.07	2.6163
Cr1_2	Cr	0.25	0.5	0.25	1.6	0	−2.07	2.6163
O1_1	O	0.2453	0.268	0.268
O1_2	O	0.2453	−0.018	−0.018

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. Reehuis et al. PHYSICAL REVIEW B? (2015) · doi:10.1103/PhysRevB.91.024407

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.891_CuCr2O4.mcif from MAGNDATA · entry page

sha256 of this copy: efe6c652ae99691a3d42131e4e38ece8d8d6241b5d5b058cd6c75dcc91ad6ed1
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.891_CuCr2O4.mcif.