Research/Sitter/MAGNDATA / 1.1.136_CrB2.mcif

CrB₂

MAGNDATA entry 1.1.136 · source

incommensurate spiral

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 spiral: the spin direction rotates as you move along.

ordered ≤ 84 K (−189 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	Cmm21′(0,0,γ)0s0s
Point group	mm21′
Parent space group	P 6/m m m No. 191
Repeats every	1.75 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.57 0 0] 1k
Cell	a 2.969 · b 5.14246 · c 3.066 Å · α 90° · β 90° · γ 90°
Transition	84 K (−189 °C)
Measured at	14 K
Magnetic ions	Cr
Largest moment component	0.5 μ_B
Method	NSD

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 Cmm21′(0,0,γ)0s0s →

Atom sites · 2 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Cr1	Cr	0	0	0
B1	B	0	0.6667	0.5

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 (μ_B), as magCIF writes them. Symmetry generates the rest of the cell from these sites.

Source

S. Funahashi et al. Solid State Communieations (1977) · doi:10.1016/0038-1098(77)90969-3

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.136_CrB2.mcif from MAGNDATA · entry page

sha256 of this copy: 296d046fc64d33e1c4d6d550405c2338fccbfa339cb07f4a6a3dd45637441f86
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.136_CrB2.mcif.