Research/Sitter/MAGNDATA / 1.1.44_CeRu2Al2B.mcif

CeRu₂Al₂B

MAGNDATA entry 1.1.44 · 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 ≤ 14.2 K (−259 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P4/mmm1′(00γ)00sss
Point group	4/mmm1′
Parent space group	P 4/m m m No. 123
Repeats every	6.76 cells along c (not a whole number: that's what incommensurate means)
Propagation	[0 0 0.148] 1k
Cell	a 4.198 · b 4.198 · c 5.607 Å · α 90° · β 90° · γ 90°
Transition	14.2 K (−259 °C)
Measured at	13 K
Magnetic ions	Ce
Largest moment component	1.8 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 P4/mmm1′(00γ)00sss →

Atom sites · 4 sites · CSV

site	element	x	y	z
Ce1	Ce	0	0	0.5
Ru1	Ru	0	0.5	0
Al1	Al	0.5	0.5	0.2555
B1	B	0	0	0

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

A. Bhattacharyya et al. PHYSICAL REVIEW B (2016) · doi:10.1103/PhysRevB.93.060410

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.44_CeRu2Al2B.mcif from MAGNDATA · entry page

sha256 of this copy: b13563e7394e1adc37b2a36c600bb1e3bd6409c66de597a73f0f735cd937f93f
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.44_CeRu2Al2B.mcif.