Research/Sitter/MAGNDATA / 0.967_BaMn2V2O8.mcif

Ba₁Mn₂V₂O₈

MAGNDATA entry 0.967 · 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 ≤ 37 K (−236 °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 4₁ c d No. 110
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 12.598 · b 12.598 · c 8.6571 Å · α 90° · β 90° · γ 90°
Transition	37 K (−236 °C)
Measured at	1.5 K
Magnetic ions	Mn
Largest moment component	2.4 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)
Ba1_1	Ba	0	0	0
Ba1_2	Ba	0	0.5	0.25
Mn1_1	Mn	0.3352	0.3281	0.252	2.4	0	0	2.4
Mn1_2	Mn	0.6719	0.8352	0.502	−2.4	0	0	2.4
V1_1	V	0.253	0.0767	0.1113
V1_2	V	0.9233	0.753	0.3613
O1_1	O	0.1625	0.507	0.0471
O1_2	O	0.493	0.6625	0.2971
O2_1	O	0.3565	0.6708	0.5183
O2_2	O	0.3292	0.8565	0.7683
O3_1	O	0.1653	0.6784	0.7572
O3_2	O	0.3216	0.6653	0.0072
O4_1	O	0.34	0.4958	0.2338
O4_2	O	0.5042	0.84	0.4838

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. Pal et al. PHYSICAL REVIEW MATERIALS (2023) · doi:10.1103/PhysRevMaterials.7.014402

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.967_BaMn2V2O8.mcif from MAGNDATA · entry page

sha256 of this copy: f55abd0a56b3b93ae6d4c62fe3c375d596b58e2e377fe49d1a3bad89fe7aa1cd
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.967_BaMn2V2O8.mcif.

Ba1Mn2V2O8

Symmetry

Source

Original file

Ba₁Mn₂V₂O₈