Research/Sitter/MAGNDATA / 0.680_Bi0.8La0.2Fe0.5Mn0.5O3.mcif

Bi_0.8La_0.2Fe_0.5Mn_0.5O₃

MAGNDATA entry 0.680 · 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 ≤ 240 K (−33 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	I m m′ a′ BNS 74.559
Parent space group	I m m a No. 74
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 5.565 · b 7.806 · c 5.5749 Å · α 90° · β 90° · γ 90°
Transition	240 K (−33 °C)
Measured at	5 K
Magnetic ions	Fe, Mn
Largest moment component	2 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′ a′ →

Atom sites · 6 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Bi1	Bi	0	0.25	0.5023
La1	La	0	0.25	0.5023
Fe1	Fe	0	0	0	0	0	2	2
Mn1	Mn	0	0	0	0	0	2	2
O1	O	0	0.25	0.0734
O2	O	0.25	0.5332	0.25

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

J. Bertinshaw et al. PHYSICAL REVIEW B (2014) · doi:10.1103/PhysRevB.89.144422

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.680_Bi0.8La0.2Fe0.5Mn0.5O3.mcif from MAGNDATA · entry page

sha256 of this copy: 2bd9bf4853b0f605a4cb9f162b373eedd725d313e869ace22b2c6891580d77a1
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.680_Bi0.8La0.2Fe0.5Mn0.5O3.mcif.