Research/Sitter/MAGNDATA / 1.1.54_CePd2Al2.mcif

CePd₂Al₂

MAGNDATA entry 1.1.54 · 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	C11b1′(α,β,0)ss
Point group	m1′
Parent space group	C m m e No. 67
Repeats every	1.85 cells along b (not a whole number: that's what incommensurate means)
Propagation	[0.06 0.54 0] 1k
Cell	a 6.268 · b 6.132 · c 9.886 Å · α 90° · β 90° · γ 90°
Transition	2.7 K (−270 °C)
Measured at	1.5 K
Magnetic ions	Ce
Largest moment component	1.38 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 C11b1′(α,β,0)ss →

Atom sites · 5 sites · CSV

site	element	x	y	z
Ce1	Ce	0	0.25	0.756
Pd1	Pd	0.25	0	0
Pd2	Pd	0	0.25	0.371
Al1	Al	0.25	0	0.5
Al2	Al	0	0.25	0.119

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 (2017) · doi:10.1103/PhysRevB.95.085107

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.54_CePd2Al2.mcif from MAGNDATA · entry page

sha256 of this copy: 9dbf1b07c3d64b552b7ca1cdcd7d9a50959f97ea72c63436275d1d1cb0fd1eaa
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.54_CePd2Al2.mcif.