Research/Sitter/MAGNDATA / 1.1.152_CrAs.mcif

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Spin lattice of As1Cr1Spin lattice of As1Cr1

As1Cr1

MAGNDATA entry 1.1.152 · 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 ≤ 267 K (−6 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.
Structure · 11 properties
Magnetic groupP211’(α0γ)0s
Point group21′
Parent space groupP n m a No. 62
Repeats every2.83 cells along c (not a whole number: that's what incommensurate means)
Propagation[0 0 0.353] 1k
Cella 5.6432 · b 3.5862 · c 6.2038 Å · α 90° · β 90° · γ 90°
Transition267 K (−6 °C)
Measured at2 K
Magnetic ionsCr
Largest moment component3.151 μB
MethodNSD and 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 P211’(α0γ)0s →
Atom sites · 4 sites · CSV
siteelementxyzmambmc|m| (μB)
As1_1As0.19920.250.5857
As1_2As0.30080.750.0857
Cr1_1Cr00.250.2034
Cr1_2Cr0.50.750.7034

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 (μB), as magCIF writes them. Symmetry generates the rest of the cell from these sites.

Source

A. Eich et al. Acta Cryst. B (2023) · doi:10.1107/S205252062300817X

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.152_CrAs.mcif from MAGNDATA · entry page

sha256 of this copy: 0c45d5033f74ff1b3b72861f0c629846dd4ed24c9acfdc42e419285928860290
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.152_CrAs.mcif.