Research/Sitter/MAGNDATA / 1.477_Ba2CoO4.mcif

Ba₂CoO₄

MAGNDATA entry 1.477 · 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 ≤ 23 K (−250 °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 11.7826 · b 7.5974 · c 20.7276 Å · α 90° · β 91.9° · γ 90°
Transition	23 K (−250 °C)
Measured at	4 K
Magnetic ions	Co
Largest moment component	3.08 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_a 2₁/c →

Atom sites · 7 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Co1	Co	0.383	0.277	0.0365	0	0.9	3.08	3.2088
Ba1	Ba	0.1172	0.4926	0.0954
Ba2	Ba	0.3785	0.8521	0.0416
O1	O	0.258	0.2045	0.0833
O2	O	0.499	0.1749	0.0712
O3	O	0.3516	0.186	0.4592
O4	O	0.387	0.5072	0.0403

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

K. Boulahya et al. Chem. Mater. (2006) · doi:10.1021/cm061044v

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.477_Ba2CoO4.mcif from MAGNDATA · entry page

sha256 of this copy: f6b93e6630d7ee79c725cb5543219b21dab2754feab64cdf287eb54f48ee1a39
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.477_Ba2CoO4.mcif.