Research/Sitter/MAGNDATA / 1.860_KCoAsO4.mcif

K₁Co₁As₁O₄

MAGNDATA entry 1.860 · source

antiferromagnet

No net magnetisation, and up and down sublattices are related by a shift or by inversion, so the bands stay spin-degenerate: a conventional antiferromagnet.

Spin group ¹1̄ × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 14 K (−259 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P_S 1 BNS 2.7
Point group	11′
Parent space group	R 3 No. 148
Spins	collinear · net moment 0 μ_B per cell
Propagation	[3/2 0 0] 1k
Cell	a 10.0812 · b 5.0406 · c 28.699 Å · α 90° · β 90° · γ 120°
Transition	14 K (−259 °C)
Measured at	0.3 K
Magnetic ions	Co
Largest moment component	3.526 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 P_S 1 →

Atom sites · 7 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
K1	K	0	0	0.2943
Co1	Co	0	0	0.1586	0.596	0	3.526	3.576
As1	As	0	0	0.5586
O1_1	O	0.01	0.343	0.122
O1_2	O	0.8285	0.677	0.122
O1_3	O	0.1615	0.98	0.122
O2	O	0	0	0.6202

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

C. L. Sarkis et al. PHYSICAL REVIEW B (2025) · doi:10.1103/rnfj-st4c

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.860_KCoAsO4.mcif from MAGNDATA · entry page

sha256 of this copy: 7bf9c1d9be52f37632bfb22125a6613216943fd2d9df8c2fc7783be0582d3473
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.860_KCoAsO4.mcif.

K1Co1As1O4

Symmetry

Source

Original file

K₁Co₁As₁O₄