Research/Sitter/MAGNDATA / 0.376_LaCaFeO4.mcif

LaCaFeO₄

MAGNDATA entry 0.376 · 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 ²m²m¹m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 373 K (100 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C m′ c′ a BNS 64.474
Parent space group	C m c e No. 64
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 5.472 · b 5.472 · c 12.34 Å · α 90° · β 90° · γ 90°
Transition	373 K (100 °C)
Measured at	4.2 K
Magnetic ions	Fe
Largest moment component	3.74 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 C m′ c′ a →

Atom sites · 5 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ca1	Ca	0	0	0.354
La1	La	0	0	0.354
Fe1	Fe	0	0	0	3.74	0	0	3.74
O1	O	0.222	0.278	0
O2	O	0	0	0.172

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

M.N. Trut-Dinh et al. J. Solid State Chem. (1980) · doi:10.1016/0022-4596(80)90262-5

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.376_LaCaFeO4.mcif from MAGNDATA · entry page

sha256 of this copy: 8dc6a17f07822fbf02ef79587afb27dc8e49da83f9f09d9199aa2d4a229b6e14
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.376_LaCaFeO4.mcif.