Research/Sitter/MAGNDATA / 0.137_Cu2V2O7.mcif

Cu₂V₂O₇

MAGNDATA entry 0.137 · 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 ²m¹m²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 33.4 K (−240 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	F d′ d′ 2 BNS 43.227
Point group	m′m′2
Parent space group	F d d 2 No. 43
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 20.678 · b 8.405 · c 6.446 Å · α 90° · β 90° · γ 90°
Transition	33.4 K (−240 °C)
Measured at	4 K
Magnetic ions	Cu
Largest moment component	0.93 μ_B
Method	NSD

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 F d′ d′ 2 →

Atom sites · 6 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Cu1	Cu	0.1655	0.3646	0.752	0.93	0	0	0.93
V1	V	0.199	0.4046	0.237
O1	O	0.246	0.5616	0.2723
O2	O	0.1443	0.4378	0.0286
O3	O	0.162	0.3461	0.4551
O4	O	0	0	0.9007

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

G. Gitgeatpong et al. PHYSICAL REVIEW B (2015) · doi:10.1103/PhysRevB.92.024423

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.137_Cu2V2O7.mcif from MAGNDATA · entry page

sha256 of this copy: 01b59aebbe0be565a2c1e04f659a9cfe9dfe810558e5fb754527df09773d94b3
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.137_Cu2V2O7.mcif.