Research/Sitter/MAGNDATA / 0.433_KMnF3.mcif

KMnF₃

MAGNDATA entry 0.433 · 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 ¹4/¹m²m²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 86.8 K (−186 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 9 properties

Magnetic group	I 4/m c m BNS 140.541
Parent space group	I 4/m c m No. 140
Spins	collinear · 4 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 5.89907 · b 5.89907 · c 8.38022 Å · α 90° · β 90° · γ 90°
Transition	86.8 K (−186 °C)
Magnetic ions	Mn
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 I 4/m c m →

Atom sites · 4 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
K1	K	0	0.5	0.25
Mn1	Mn	0	0	0	0	0	1	1
F1	F	0	0	0.25
F2	F	0.2257	0.2743	0

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

K.S. Knight et al. Journal of Alloys and Compounds (2020) · doi:10.1016/j.jallcom.2020.155935

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.433_KMnF3.mcif from MAGNDATA · entry page

sha256 of this copy: 568706b75e9f5837111d5b5abb65f79785aef4d9031f5300ea4521afa80c594f
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.433_KMnF3.mcif.