Research/Sitter/MAGNDATA / 1.1.144_CePdAl.mcif

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Spin lattice of Ce1Pd1Al1Spin lattice of Ce1Pd1Al1

Ce1Pd1Al1

MAGNDATA entry 1.1.144 · 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 groupXm2m1′(0,0,γ)000s
Point groupmm21′
Parent space groupP 6 2 m No. 189
Repeats every2.86 cells along c (not a whole number: that's what incommensurate means)
Propagation[0 0 0.35] 1k
Cella 12.46211 · b 7.195 · c 4.24 Å · α 90° · β 90° · γ 90°
Transition2.7 K (−270 °C)
Measured at1.5 K
Magnetic ionsCe
Largest moment component1.58 μB
MethodNPD

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 Xm2m1′(0,0,γ)000s →
Atom sites · 6 sites · CSV
siteelementxyzmambmc|m| (μB)
Ce1_1Ce0.28930.71070
Ce1_2Ce00.57850
Pd1_1Pd000
Pd2_1Pd0.16670.50.5
Al1_1Al0.1140.8860.5
Al1_2Al00.2280.5

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. Donni et al. J. Phys.: Condens. Matter (1996) · doi:10.1088/0953-8984/8/50/043

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.144_CePdAl.mcif from MAGNDATA · entry page

sha256 of this copy: cf08b95eb224107d845c3f349dc27f23adb3c5c6ed9a42dbfff6e15b55efa890
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.144_CePdAl.mcif.