Research/Sitter/MAGNDATA / 1.1.1_Cs2CuCl4.mcif

Cs₂CuCl₄

MAGNDATA entry 1.1.1 · 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 ≤ 0.6 K (−273 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	Pnma1′(0β0)000s
Point group	mmm1′
Parent space group	P n m a No. 62
Repeats every	2.12 cells along b (not a whole number: that's what incommensurate means)
Propagation	[0 0.472 0] 1k
Cell	a 9.769 · b 7.607 · c 12.381 Å · α 90° · β 90° · γ 90°
Transition	0.62 K (−273 °C)
Measured at	0.3 K
Magnetic ions	Cu
Largest moment component	0.84 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 Pnma1′(0β0)000s →

Atom sites · 6 sites · CSV

site	element	x	y	z
Cs1	Cs	0.134	0.25	0.1031
Cs2	Cs	−0.0567	0.75	0.3252
Cu1	Cu	0.2302	0.25	0.4182
Cl1	Cl	0.3433	0.25	0.5739
Cl2	Cl	0.005	0.25	0.382
Cl3	Cl	0.2936	−0.0119	0.355

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

R. Coldea et al. J. Phys.: Condens. Matter (1996) · doi:10.1088/0953-8984/8/40/012

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.1_Cs2CuCl4.mcif from MAGNDATA · entry page

sha256 of this copy: 4e6a621b12bde0112029fb3ab0fcdbef82b05a5301a02a52e433f63559246e59
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.1_Cs2CuCl4.mcif.