Research/Sitter/MAGNDATA / 0.332_Co2Mo3O8.mcif

Co₂Mo₃O₈

MAGNDATA entry 0.332 · source

g-wave altermagnet

No net magnetisation, yet the electron bands are spin-split: the up and down spin sublattices are related only by a rotation or mirror, never by a shift or inversion. g-wave: 4 nodal planes.

Spin group ²6/²m¹m²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 42 K (−231 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P 6₃′ m′ c BNS 186.205
Parent space group	P 6₃ m c No. 186
Spins	collinear · 4 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 5.767 · b 5.767 · c 9.916 Å · α 90° · β 90° · γ 120°
Transition	42 K (−231 °C)
Measured at	4.2 K
Magnetic ions	Co
Largest moment component	3.3 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 6₃′ m′ c →

Atom sites · 7 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Co1	Co	0.3333	0.6667	0.928	0	0	3.3	3.3
Co2	Co	0.3333	0.6667	0.511	0	0	3.3	3.3
Mo1	Mo	0.147	0.853	0.25
O1	O	0	0	0.386
O2	O	0.3333	0.6667	0.14
O3	O	0.492	0.508	0.377
O4	O	0.149	0.851	0.631

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

D. Bertrand et al. J. Physique (1975) · doi:10.1051/jphys:01975003605037900

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.332_Co2Mo3O8.mcif from MAGNDATA · entry page

sha256 of this copy: 2e15c10740ecffc99bf693e95c269f6a242a522109859bc43cd2b92bd2107a9b
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.332_Co2Mo3O8.mcif.