Research/Sitter/MAGNDATA / 0.34_La0.5Sr0.5FeO2.5F0.5.mcif

La_0.5Sr_0.5FeO_2.5F_0.5

MAGNDATA entry 0.34 · 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 ≤ 700 K (427 °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 5.5575 · b 7.8731 · c 5.5887 Å · α 90° · β 90° · γ 90°
Transition	700 K (427 °C)
Measured at	290 K
Magnetic ions	Fe
Largest moment component	3.5 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 · 7 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Sr	Sr	0.9928	0.25	0.4975
La	La	0.9928	0.25	0.4975
Fe	Fe	0	0	0	0	0	3.5	3.5
O1	O	0.0015	0.25	0.9369
F1	F	0.0015	0.25	0.9369
O2	O	0.2376	0.0346	0.261
F2	F	0.2376	0.0346	0.261

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

O. Clemens et al. Journal of Solid State Chemistry (2013) · doi:10.1016/j.jssc.2013.08.013

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.34_La0.5Sr0.5FeO2.5F0.5.mcif from MAGNDATA · entry page

sha256 of this copy: 2145523065c4e588a0dab12859fedded572f10ee27c59dbc549176ea922c4e86
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.34_La0.5Sr0.5FeO2.5F0.5.mcif.