Research/Sitter/MAGNDATA / 1.1.64_K2MnS2.mcif

K₂MnS₂

MAGNDATA entry 1.1.64 · 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 ≤ 17 K (−256 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	Ic2m1′(α,0,0)000s
Point group	m2m1′
Parent space group	Ibam No. 72
Repeats every	2.38 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.42 0 0] 1k
Cell	a 6.932 · b 12.636 · c 6.179 Å · α 90° · β 90° · γ 90°
Transition	17 K (−256 °C)
Measured at	4 K
Magnetic ions	Mn
Largest moment component	2.279 μ_B
Method	NSD and 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 Ic2m1′(α,0,0)000s →

Atom sites · 5 sites · CSV

site	element	x	y	z
K1_1	K	0.345	0.1478	0
K1_2	K	0.845	0.3522	0
Mn1_1	Mn	0	0	0.25
S1_1	S	0.1953	0.8965	0
S1_2	S	0.6953	0.6035	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

A. Bhutani et al. PHYSICAL REVIEW MATERIALS (2019) · doi:10.1103/PhysRevMaterials.3.064404

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.64_K2MnS2.mcif from MAGNDATA · entry page

sha256 of this copy: 9a6f9e25561599a56475c44caeff22fcdc4ebdeabee14ed2c5281e11086889d3
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.64_K2MnS2.mcif.