Research/Sitter/MAGNDATA / 1.302_Ba2CoO4.mcif

Ba₂CoO₄

MAGNDATA entry 1.302 · source

noncollinear antiferromagnet

All moments add up to a net magnetisation: an ordinary magnet. Spin splitting is the same in every direction (s-wave).

ordered ≤ 26 K (−247 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P_a 2₁/c BNS 14.80
Parent space group	P 2₁/n No. 14
Spins	coplanar · net moment 0 μ_B per cell
Propagation	[1/2 0 1/2] 1k
Cell	a 11.768 · b 7.54 · c 20.686 Å · α 90° · β 90.52° · γ 90°
Transition	26 K (−247 °C)
Measured at	5 K
Magnetic ions	Co
Largest moment component	2.377 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 P_a 2₁/c →

Atom sites · 7 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ba1	Ba	0.3805	0.852	0.042
Ba2	Ba	0.123	0.492	0.097
Co1	Co	0.371	0.279	0.0385	2.377	1.128	0.586	2.6908
O1	O	0.391	0.507	0.0405
O2	O	0.26	0.207	0.0875
O3	O	0.495	0.172	0.068
O4	O	0.354	0.185	0.4625

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

Q. Zhang et al. PHYSICAL REVIEW B (2019) · doi:10.1103/PhysRevB.99.094416

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.302_Ba2CoO4.mcif from MAGNDATA · entry page

sha256 of this copy: 4cf8def190ac80b9f10d490caf12858a4652a6186782927fb499cadd44983270
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.302_Ba2CoO4.mcif.