Research/Sitter/MAGNDATA / 0.210_Sr2CoOsO6.mcif

Sr₂CoOsO₆

MAGNDATA entry 0.210 · source

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.

Spin group ²2/²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 108 K (−165 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C 2/c BNS 15.85
Parent space group	B 2/n No. 15
Spins	collinear · 1 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 7.8102 · b 7.7585 · c 7.9967 Å · α 90° · β 90° · γ 90°
Transition	108 K (−165 °C)
Measured at	87 K
Magnetic ions	Co, Os
Largest moment component	1.13 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 C 2/c →

Atom sites · 7 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Sr1	Sr	0.25	0.75	0.2495
Sr2	Sr	0.25	0.75	0.7505
Co1	Co	0.5	0	0.5	1.13	1.09	0	1.57
Os1	Os	0.5	0.5	0.5	−0.51	−0.48	0	0.7004
O1	O	0.0077	0	0.2556
O21	O	0.9627	0.2564	0
O22	O	0.2555	0.0377	0.9902

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

B. Yan et al. Phys. Rev. Lett. (2014) · doi:10.1103/PhysRevLett.112.147202

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.210_Sr2CoOsO6.mcif from MAGNDATA · entry page

sha256 of this copy: d41c0cf25eafc97a47d02decae807b9bb53e3af65258ab7771a7ca48db76c239
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.210_Sr2CoOsO6.mcif.