Research/Sitter/MAGNDATA / 0.708_CrNb4S8.mcif

CrNb₄S₈

MAGNDATA entry 0.708 · 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.

Structure · 9 properties

Magnetic group	P 6₃′/m′ m′ c BNS 194.268
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 6.626 · b 6.626 · c 11.952 Å · α 90° · β 90° · γ 120°
Measured at	4.2 K
Magnetic ions	Cr
Largest moment component	1.5 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)
Nb1	Nb	0	0	0.25
Nb2	Nb	0.5023	0.0046	0.25
Cr1	Cr	0	0	0	0	0	1.5	1.5
S1	S	0.3333	0.6667	0.1156
S2	S	0.8307	0.6614	0.3812

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

B. Van Laar et al. JOURNAL OF SOLID STATE CHEMISTRY (1971) · doi:10.1016/0022-4596(71)90019-3

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.708_CrNb4S8.mcif from MAGNDATA · entry page

sha256 of this copy: 8a78050321515668b776384f79768574374dceb6710b4767e45685531b4c37d3
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.708_CrNb4S8.mcif.