Research/Sitter/MAGNDATA / 0.511_Co4Ta2O9.mcif

Co₄Ta₂O₉

MAGNDATA entry 0.511 · 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 ≤ 20 K (−253 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C 2′/c BNS 15.87
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 5.1718 · b 5.1718 · c 14.127 Å · α 90° · β 90° · γ 120°
Transition	20 K (−253 °C)
Measured at	15 K
Magnetic ions	Co
Largest moment component	2.3 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 C 2′/c →

Atom sites · 8 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Co1	Co	0.3333	0.6667	0.1919	−0.73	2.3	0	2.739
Co2	Co	0.3333	0.6667	0.986	0.73	2.3	0	2.0357
Ta1	Ta	0	0	0.1428
O1_1	O	0.287	0	0.25
O1_2	O	0	0.287	0.25
O2_1	O	0.023	0.6814	0.0844
O2_2	O	0.3186	0.3416	0.0844
O2_3	O	0.6584	0.977	0.0844

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

S. Choi et al. PHYSICAL REVIEW B (2020) · doi:10.1103/PhysRevB.102.214404

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.511_Co4Ta2O9.mcif from MAGNDATA · entry page

sha256 of this copy: a018e127e81ec99427969abd99bfe57e350d4a9b18335ac2ccbd6ef4c29635b7
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.511_Co4Ta2O9.mcif.