Research/Sitter/MAGNDATA / 1.0.39_BaMnO3.mcif

BaMnO₃

MAGNDATA entry 1.0.39 · source

g-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. g-wave: 4 nodal planes.

Spin group ²6/²m²m¹m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 2.3 K (−271 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P 6₃′/m′ c m′ BNS 193.259
Parent space group	P 6₃/m m c No. 194
Spins	collinear · 4 nodal planes · net moment 0 μ_B per cell
Propagation	[1/3 1/3 0] · [0 0 0] 1k
Cell	a 9.8623 · b 9.8623 · c 4.806 Å · α 90° · β 90° · γ 120°
Transition	2.3 K (−271 °C)
Measured at	1.8 K
Magnetic ions	Mn
Largest moment component	3 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 6₃′/m′ c m′ →

Atom sites · 5 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Mn1_1	Mn	0	0	0	0	0	3	3
Mn1_2	Mn	0.3333	0.6667	0	0	0	−3	3
Ba1	Ba	0.3333	0.3333	0.75
O1_1	O	0.145	0.145	0.25
O1_2	O	0.4783	0.8117	0.25

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. N. Christensen et al. JOURNAL OF SOLID STATE CHEMISTRY (1972) · doi:10.1016/0022-4596(72)90141-7

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.0.39_BaMnO3.mcif from MAGNDATA · entry page

sha256 of this copy: e1eb16e10111af96d79fe73f544f4c6df0fc239d33a10e502bcc3b50248ac6b6
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.0.39_BaMnO3.mcif.