Research/Sitter/MAGNDATA / 0.825_Ca2MnGaO5.mcif

Ca₂MnGaO₅

MAGNDATA entry 0.825 · 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 ≤ 160 K (−113 °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 62.447
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 5.2677 · b 15.2928 · c 5.4679 Å · α 90° · β 90° · γ 90°
Transition	160 K (−113 °C)
Measured at	1.6 K
Magnetic ions	Mn
Largest moment component	3.6 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 · 6 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ca1	Ca	0.4903	0.1095	0.0236
Mn1	Mn	0	0	0	0	3.6	0	3.6
Ga1	Ga	0.4724	0.25	0.5652
O1	O	0.248	0.9886	0.238
O2	O	0.017	0.147	0.067
O3	O	0.602	0.25	0.877

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

⬇ 0.825_Ca2MnGaO5.mcif from MAGNDATA · entry page

sha256 of this copy: 2ef1a5534ceaedcd1b60bd7c788bca7bd699c49f4bc7a80f8b506be79ca9fbe4
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.825_Ca2MnGaO5.mcif.