Research/Sitter/MAGNDATA / 1.1.40_FeOCl.mcif

FeOCl

MAGNDATA entry 1.1.40 · 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 ≤ 80 K (−193 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	X2/n1′(αβ0)00s
Point group	2/m1′
Parent space group	P m m n No. 59
Repeats every	2 cells along b (not a whole number: that's what incommensurate means)
Propagation	[0.285714 0.5 0] 1k
Cell	a 3.2992 · b 3.7745 · c 15.817 Å · α 90° · β 90° · γ 90°
Transition	80 K (−193 °C)
Magnetic ions	Fe
Largest moment component	4.01 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 X2/n1′(αβ0)00s →

Atom sites · 3 sites · CSV

site	element	x	y	z
Fe1	Fe	0.75	0.25	0.0577
O1	O	0.25	0.25	0.4755
Cl1	Cl	0.25	0.25	0.1651

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.R. Hwang et al. Phys. Rev. B (2000) · doi:10.1103/PhysRevB.62.14157

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.40_FeOCl.mcif from MAGNDATA · entry page

sha256 of this copy: 113225f4735abe89bffeba9854153b4d5ecce499d4e5cdfd34dcd09c5487419d
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.40_FeOCl.mcif.