Research/Sitter/MAGNDATA / 0.25_NaOsO3.mcif

NaOsO₃

MAGNDATA entry 0.25 · 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.

ordered ≤ 410 K (137 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P n′ m a′ BNS 62.448
Point group	m′m′m
Parent space group	P n m a No. 62
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 5.3842 · b 7.5804 · c 5.3282 Å · α 90° · β 90° · γ 90°
Transition	410 K (137 °C)
Measured at	200 K
Magnetic ions	Os
Largest moment component	1 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 n′ m a′ →

Atom sites · 4 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Na1	Na	0.0328	0.25	0.9993
Os1	Os	0	0	0.5	0	0	1	1
O1	O	0.4834	0.25	0.0808
O2	O	0.2881	0.0394	0.7112

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

S. Calder et al. PHYSICAL REVIEW LETTERS (2012) · doi:10.1103/physrevlett.108.257209

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.25_NaOsO3.mcif from MAGNDATA · entry page

sha256 of this copy: 1630cfc2d54e9341496c9541e0e1e553d7eb4529f53e522f9425ac363eab2688
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.25_NaOsO3.mcif.