Research/Sitter/MAGNDATA / 1.1.4_Cr.mcif

Cr

MAGNDATA entry 1.1.4 · 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 ≤ 123 K (−150 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	I4/mmm1′(00γ)00sss
Point group	4/mmm1′
Parent space group	I m 3m No. 229
Repeats every	1.05 cells along c (not a whole number: that's what incommensurate means)
Propagation	[0 0 0.95] 1k
Cell	a 2.884 · b 2.884 · c 2.884 Å · α 90° · β 90° · γ 90°
Transition	123 K (−150 °C)
Magnetic ions	Cr
Largest moment component	0.6 μ_B
Method	Phase II

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 I4/mmm1′(00γ)00sss →

Atom sites · 1 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Cr1	Cr	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

J.M. Perez-Mato et al. J. Phys.: Condens. Matter (2012) · doi:10.1088/0953-8984/24/16/163201

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.4_Cr.mcif from MAGNDATA · entry page

sha256 of this copy: 4db13fcadfdf00fcda0e97bc14bd27ca6e31fcb68ea93550d9cf6ce09b6f7d53
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.4_Cr.mcif.