Research/Sitter/MAGNDATA / 0.896_NiCrO4.mcif

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Spin lattice of Ni1Cr1O4Spin lattice of Ni1Cr1O4

Ni1Cr1O4

MAGNDATA entry 0.896 · 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 ¹m²m²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.
Structure · 10 properties
Magnetic groupC m c m BNS 63.457
Point groupmmm
Parent space groupC m c m No. 63
Spinscollinear · 2 nodal planes · net moment 0 μB per cell
Propagation[0 0 0] 1k
Cella 5.484 · b 8.22 · c 6.127 Å · α 90° · β 90° · γ 90°
Measured at4.2 K
Magnetic ionsNi
Largest moment component0.64 μB
MethodNPD

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 m c m →
Atom sites · 4 sites · CSV
siteelementxyzmambmc|m| (μB)
Ni1Ni0000.64000.64
Cr1Cr00.350.25
O1O00.2390.036
O2O0.2680.4690.25

Moment components are along the crystal axes a, b, c (μB), as magCIF writes them. Symmetry generates the rest of the cell from these sites.

Source

M. Pernet et al. Bull. Soc. fr. Mineral. (1969) · doi:10.3406/bulmi.1969.6355

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.896_NiCrO4.mcif from MAGNDATA · entry page

sha256 of this copy: 99b8f4936dc23e35844a46541d57868573cbc01b700515c6506208b9f26a84ba
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.896_NiCrO4.mcif.