Research/Sitter/MAGNDATA / 1.0.47_MnSe2.mcif

MnSe₂

MAGNDATA entry 1.0.47 · 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 ¹m²m²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 49 K (−224 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 9 properties

Magnetic group	P b c a BNS 61.433
Parent space group	P a 3 No. 205
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[1/3 0 0] · [0 0 0] 1k
Cell	a 19.2825 · b 6.4275 · c 6.4275 Å · α 90° · β 90° · γ 90°
Transition	49 K (−224 °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 P b c a →

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	1	0	0	1
Mn1_2	Mn	0.1667	0	0.5	1	0	0	1
Se1_1	Se	0.1312	0.3936	0.3936
Se1_2	Se	0.0355	0.6064	0.8936
Se1_3	Se	0.2979	0.1064	0.6064

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

L. M. Corliss et al. Journal of Applied Physics (1958) · doi:10.1063/1.1723149

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.0.47_MnSe2.mcif from MAGNDATA · entry page

sha256 of this copy: 4361a5f59b49ebe4487c648984d1046281978631a35c1686e582b674b254a6b5
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.0.47_MnSe2.mcif.