Research/Sitter/MAGNDATA / 0.62_SrMn2V2O8.mcif

SrMn₂V₂O₈

MAGNDATA entry 0.62 · 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.

ordered ≤ 42.2 K (−231 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	I b′ a 2′ BNS 45.237
Point group	m′m2′
Parent space group	I 4₁c d No. 110
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 12.4422 · b 12.4422 · c 8.6833 Å · α 90° · β 90° · γ 90°
Transition	42.2 K (−231 °C)
Measured at	1.5 K
Magnetic ions	Mn
Largest moment component	3.99 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 I b′ a 2′ →

Atom sites · 14 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Sr1_1	Sr	0	0	0
Sr1_2	Sr	0	0.5	0.25
V1_1	V	0.2641	0.079	0.0779
V1_2	V	0.921	0.7641	0.3279
Mn1_1	Mn	0.3308	0.3322	0.2102	0	−3.99	0	3.99
Mn1_2	Mn	0.6679	0.8308	0.4602	0	3.99	0	3.99
O1_1	O	0.1408	0.4981	0.992
O1_2	O	0.5019	0.6408	0.242
O2_1	O	0.1533	0.6869	0.7009
O2_2	O	0.3131	0.6533	0.9509
O3_1	O	0.3239	0.4995	0.171
O3_2	O	0.5005	0.8239	0.421
O4_1	O	0.3328	0.156	0.2124
O4_2	O	0.844	0.8328	0.4624

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

A.K. Bera et al. PHYSICAL REVIEW B (2014) · doi:10.1103/physrevb.89.094402

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.62_SrMn2V2O8.mcif from MAGNDATA · entry page

sha256 of this copy: 27c0a1c353abcfeeddd12adb234e10e78e55b47f24f01d3cf9750022ed21e194
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.62_SrMn2V2O8.mcif.