Research/Sitter/MAGNDATA / 1.1.72_CuCrO2.mcif

CuCrO₂

MAGNDATA entry 1.1.72 · source

incommensurate spiral

Incommensurate: the magnetic pattern repeats every so many cells, but not a whole number of them, so it never lines up with the crystal lattice. Here it's a spiral: the spin direction rotates as you move along.

ordered ≤ 23.6 K (−250 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	X21′(α,α,0)ss
Point group	21′
Parent space group	R 3 m No. 166
Repeats every	3.03 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.3298 0.3298 0] 1k
Cell	a 2.9734 · b 2.9734 · c 17.1 Å · α 90° · β 90° · γ 120°
Transition	23.6 K (−250 °C)
Measured at	5 K
Magnetic ions	Cr
Largest moment component	2.8 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 X21′(α,α,0)ss →

Atom sites · 3 sites · CSV

site	element	z
Cu1	Cu	0
Cr1	Cr	0.5
O1	O	0.1079

Incommensurate: the moments are modulated; the picture evaluates each atom's Fourier series at its own phase.

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. Frontzek et al. J. Phys.: Condens. Matter (2012) · doi:10.1088/0953-8984/24/1/016004

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.72_CuCrO2.mcif from MAGNDATA · entry page

sha256 of this copy: e3bf3c426dec1d5bd119818dac79766f1cb08781a6a3ed8db71393a01cf79044
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.72_CuCrO2.mcif.