Research/Sitter/MAGNDATA / 0.499_UCr2Si2C.mcif

UCr₂Si₂C

MAGNDATA entry 0.499 · source

d-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. d-wave: the splitting changes sign twice around the Fermi surface (2 nodal planes).

Spin group ²4/¹m¹m²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

Structure · 9 properties

Magnetic group	P m′ m′ m BNS 47.252
Parent space group	P 4/m m m No. 123
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 3.983 · b 3.983 · c 5.16 Å · α 90° · β 90° · γ 90°
Measured at	2 K
Magnetic ions	Cr, U
Largest moment component	0.66 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 m′ m′ m →

Atom sites · 5 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
U1	U	0	0	0
Cr1_1	Cr	0	0.5	0.5	0.66	0	0	0.66
Cr1_2	Cr	0.5	0	0.5	−0.66	0	0	0.66
Si1	Si	0.5	0.5	0.2247
C1	C	0	0	0.5

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

P. Lemoine et al. Inorg. Chem. (2018) · doi:10.1021/acs.inorgchem.7b02901

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.499_UCr2Si2C.mcif from MAGNDATA · entry page

sha256 of this copy: 6471c1859db00987df77629c14f8fd4edb8326573e07f4c9319af6e227eca867
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.499_UCr2Si2C.mcif.