Research/Sitter/MAGNDATA / 1.1.84_CuCl2.mcif

CuCl₂

MAGNDATA entry 1.1.84 · 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 ≤ 23.9 K (−249 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	Cm1′(0β1/2)0s
Point group	m1′
Parent space group	C 2/m No. 12
Repeats every	1.29 cells along b (not a whole number: that's what incommensurate means)
Propagation	[0 0.7743 0.5] 1k
Cell	a 6.7986 · b 3.29418 · c 6.7718 Å · α 90° · β 122.45° · γ 90°
Transition	23.9 K (−249 °C)
Measured at	2 K
Magnetic ions	Cu
Largest moment component	0.5 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 Cm1′(0β1/2)0s →

Atom sites · 3 sites · CSV

site	element	x	z
Cu1	Cu	0	0
Cl1_1	Cl	0.5048	0.2294
Cl1_2	Cl	−0.5048	−0.2294

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.G. Banks et al. PHYSICAL REVIEW B (2009) · doi:10.1103/PhysRevB.80.024404

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.84_CuCl2.mcif from MAGNDATA · entry page

sha256 of this copy: d001636e48e5c603f0292dac670980e3b7ab8affc97b25dc1b7b682f8e182b24
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.84_CuCl2.mcif.