Research/Sitter/MAGNDATA / 0.1036_CoTa4Se8.mcif

Co₁Ta₄Se₈

MAGNDATA entry 0.1036 · 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 ≤ 173 K (−100 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P 6₃′/m′ m′ c BNS 194.268
Point group	6′/m′mm′
Parent space group	P 6₃/m m c No. 194
Spins	collinear · 4 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 6.8828 · b 6.8828 · c 12.4535 Å · α 90° · β 90° · γ 120°
Transition	173 K (−100 °C)
Measured at	10 K
Magnetic ions	Co
Largest moment component	1.35 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′ m′ c →

Atom sites · 5 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Co1	Co	0	0	0	0	0	1.35	1.35
Ta1	Ta	0	0	0.25
Ta2	Ta	0.4915	0.983	0.25
Se1	Se	0.8311	0.6622	0.3816
Se2	Se	0.3333	0.6667	0.1104

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

H. C. Mandujano et al. PHYSICAL REVIEW B (2024) · doi:10.1103/PhysRevB.110.144420

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.1036_CoTa4Se8.mcif from MAGNDATA · entry page

sha256 of this copy: d928b6651eb01ef0c179f96df8e12a80dba6100a29c681dee5a4cf985a0808be
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.1036_CoTa4Se8.mcif.

Co1Ta4Se8

Symmetry

Source

Original file

Co₁Ta₄Se₈