Research/Sitter/MAGNDATA / 0.755_Mn2SeO3F2.mcif

Mn₂SeO₃F₂

MAGNDATA entry 0.755 · 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 ≤ 26 K (−247 °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 62.448
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 7.4958 · b 10.3382 · c 5.4717 Å · α 90° · β 90° · γ 90°
Transition	26 K (−247 °C)
Measured at	1.5 K
Magnetic ions	Mn
Largest moment component	4.34 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 · 5 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Mn1	Mn	0.0955	0.0674	0.2493	0	0	4.34	4.34
Se1	Se	0.822	0.25	0.6474
F1	F	0.8426	0.0461	0.0689
O1	O	0.6728	0.25	0.4104
O2	O	0.5453	0.6238	0.0707

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

T. Zhu et al. Inorg. Chem. (2021) · doi:10.1021/acs.inorgchem.1c01074

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.755_Mn2SeO3F2.mcif from MAGNDATA · entry page

sha256 of this copy: f03ae9bd33fb6a98fba8cd52bc7f5381d2188c373dc381ce8ad01bfea95a09ba
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.755_Mn2SeO3F2.mcif.