Research/Sitter/MAGNDATA / 1.1.68_CeAlGe.mcif

CeAlGe

MAGNDATA entry 1.1.68 · 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 ≤ 4.4 K (−269 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	Imm21′(α00)0s0s
Point group	mm21′
Parent space group	I 4₁ m d No. 109
Repeats every	15.15 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.066 0 0] 1k
Cell	a 4.2572 · b 4.2572 · c 14.6452 Å · α 90° · β 90° · γ 90°
Transition	4.4 K (−269 °C)
Measured at	1.5 K
Magnetic ions	Ce
Largest moment component	1.45 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 Imm21′(α00)0s0s →

Atom sites · 6 sites · CSV

site	element	y	z
Al1_1	Al	0	0.18
Al1_2	Al	0.5	0.43
Ce1_1	Ce	0	0.59
Ce1_2	Ce	0.5	0.84
Ge1_1	Ge	0	0.01
Ge1_2	Ge	0.5	0.26

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

P. Puphal et al. PHYSICAL REVIEW LETTERS (2020) · doi:10.1103/PhysRevLett.124.017202

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.68_CeAlGe.mcif from MAGNDATA · entry page

sha256 of this copy: 490638f75089c6cf233d7d0328e857bfccfb3618166ef913a89c2d3060876410
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.68_CeAlGe.mcif.