Research/Sitter/MAGNDATA / 0.197_Co4Nb2O9.mcif

Co₄Nb₂O₉

MAGNDATA entry 0.197 · 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 ≤ 28 K (−245 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C 2/c′ BNS 15.88
Parent space group	P 3 c 1 No. 165
Spins	coplanar · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 5.1471 · b 5.1471 · c 14.0724 Å · α 90° · β 90° · γ 120°
Transition	28 K (−245 °C)
Measured at	5 K
Magnetic ions	Co
Largest moment component	2.842 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 C 2/c′ →

Atom sites · 8 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Nb1	Nb	0	0	0.3577
Co1	Co	0.3333	0.6667	0.017	2.677	1.312	0	2.3185
Co2	Co	0.3333	0.6667	0.3078	2.842	1.953	0	2.5181
O1_1	O	0.2901	0	0.25
O1_2	O	0	0.2901	0.25
O2_1	O	0.3437	0.3205	0.0857
O2_2	O	0.6795	0.0232	0.0857
O2_3	O	0.9768	0.6563	0.0857

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

G. Deng et al. Phys. Rev. B (2018) · doi:10.1103/PhysRevB.97.085154

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.197_Co4Nb2O9.mcif from MAGNDATA · entry page

sha256 of this copy: 47399526d74647e0eb48e2ffb23164f00f5825242948c595b36a33ec1e926787
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.197_Co4Nb2O9.mcif.