Research/Sitter/MAGNDATA / 1.1.104_CeCuAl3.mcif

CeCuAl₃

MAGNDATA entry 1.1.104 · source

incommensurate spin-density wave

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 spin-density wave: the size of the spin swells and shrinks as you move along.

ordered ≤ 2.7 K (−270 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	I1121′(α,β,0)0s
Point group	21′
Parent space group	I 4 m m No. 107
Repeats every	1.67 cells along b (not a whole number: that's what incommensurate means)
Propagation	[0.4 0.6 0] 1k
Cell	a 4.2527 · b 4.2527 · c 10.668 Å · α 90° · β 90° · γ 90°
Transition	2.7 K (−270 °C)
Measured at	1.7 K
Magnetic ions	Ce
Largest moment component	0.2 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 I1121′(α,β,0)0s →

Atom sites · 5 sites · CSV

site	element	y	z
Ce1	Ce	0	0
Cu1	Cu	0	0.5946
Al1	Al	0	0.3689
Al2_1	Al	0.5	0.2508
Al2_2	Al	0.5	0.7508

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. Klicpera et al. PHYSICAL REVIEW B (2015) · doi:10.1103/PhysRevB.91.224419

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.104_CeCuAl3.mcif from MAGNDATA · entry page

sha256 of this copy: 19c58909ea52d03659f9af875c91fd64d4d081663b011b0dfae7aa1a3b3da4b0
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.104_CeCuAl3.mcif.