Research/Sitter/MAGNDATA / 1.1.125_PrCoAl4.mcif

PrCoAl₄

MAGNDATA entry 1.1.125 · 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 ≤ 17 K (−256 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	Pmma1′(0,0,γ)ss0s
Point group	mmm1′
Parent space group	P m m a No. 51
Repeats every	2.29 cells along c (not a whole number: that's what incommensurate means)
Propagation	[0 0 0.437] 1k
Cell	a 7.644 · b 4.0431 · c 6.8717 Å · α 90° · β 90° · γ 90°
Transition	17 K (−256 °C)
Measured at	1.5 K
Magnetic ions	Pr
Largest moment component	2.13 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 Pmma1′(0,0,γ)ss0s →

Atom sites · 5 sites · CSV

site	element	x	y	z
Pr1	Pr	0.25	0	0.386
Co1	Co	0.25	0	0.807
Al1	Al	0	0	0
Al2	Al	0.25	0.5	0.037
Al3	Al	0.069	0.5	0.696

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. Schobinger-Papamantellos et al. Journal of Magnetism and Magnetic Materials (2001) · doi:10.1016/S0304-8853(01)00062-2

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.125_PrCoAl4.mcif from MAGNDATA · entry page

sha256 of this copy: 318bc2811ce49eca74f157c00b6ef0ef690a2927d78b304007e167a9b3265bcb
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.125_PrCoAl4.mcif.