Research/Sitter/MAGNDATA / 0.522_La2O3FeMnSe2.mcif

La₂O₃FeMnSe₂

MAGNDATA entry 0.522 · 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 ²4/¹m¹m²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 76 K (−197 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	I m′ m′ m BNS 71.536
Parent space group	I 4/m m m No. 139
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 4.0856 · b 4.0856 · c 18.685 Å · α 90° · β 90° · γ 90°
Transition	76 K (−197 °C)
Measured at	2 K
Magnetic ions	Fe, Mn
Largest moment component	3.44 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 m′ m′ m →

Atom sites · 8 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
La1	La	0	0	0.6831
Fe1_1	Fe	0	0.5	0	3.44	0	0	3.44
Fe1_2	Fe	0.5	0	0	−3.44	0	0	3.44
Mn1_1	Mn	0	0.5	0	3.44	0	0	3.44
Mn1_2	Mn	0.5	0	0	−3.44	0	0	3.44
O1	O	0	0.5	0.25
O2	O	0	0	0.5
Se1	Se	0	0	0.0995

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

S. Landsgesell et al. J. Phys.: Condens. Matter (2013) · doi:10.1088/0953-8984/25/8/086004

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.522_La2O3FeMnSe2.mcif from MAGNDATA · entry page

sha256 of this copy: 63a4ac4ebe852cd017202a5684ab71409094d0106456691bd5fbfd1f79dfc524
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.522_La2O3FeMnSe2.mcif.