Research/Sitter/MAGNDATA / 0.823_Sr2MnGaO5.mcif

Sr₂MnGaO₅

MAGNDATA entry 0.823 · 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 ²m²m¹m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 180 K (−93 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	I m′ a 2′ BNS 46.243
Point group	m′m2′
Parent space group	I m a 2 No. 46
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 16.1971 · b 5.5257 · c 5.3863 Å · α 90° · β 90° · γ 90°
Transition	180 K (−93 °C)
Measured at	1.6 K
Magnetic ions	Mn
Largest moment component	3.16 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 m′ a 2′ →

Atom sites · 6 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Mn1	Mn	0	0	0	3.16	0	0	3.16
Sr1	Sr	0.1111	0.0118	0.4986
Ga1	Ga	0.25	0.9331	0.0363
O1	O	0.9959	0.2545	0.2504
O2	O	0.1449	0.0419	0.0016
O3	O	0.25	0.6259	0.1155

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

V. Yu. Pomjakushin et al. PHYSICAL REVIEW B (2002) · doi:10.1103/PhysRevB.66.184412

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.823_Sr2MnGaO5.mcif from MAGNDATA · entry page

sha256 of this copy: 984fb7ebec5bc5afd26837f6a451723624ed479a5da498e6ecf3083e424e5bc9
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.823_Sr2MnGaO5.mcif.