Research/Sitter/MAGNDATA / 0.263_Fe2PO5.mcif

Fe₂PO₅

MAGNDATA entry 0.263 · 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 ²m¹m²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 250 K (−23 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P n m a BNS 62.441
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 7.3881 · b 6.4142 · c 7.4179 Å · α 90° · β 90° · γ 90°
Transition	250 K (−23 °C)
Measured at	12.1 K
Magnetic ions	Fe
Largest moment component	4.22 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)
Fe1	Fe	0	0	0	0	3.89	0	3.89
Fe2	Fe	0.3409	0.75	0.2133	0	−4.22	0	4.22
P1	P	0.3791	0.25	0.1295
O1	O	0.0971	0.75	0.1408
O2	O	0.7899	0.75	−0.0017
O3	O	0.0518	0.25	0.4784
O4	O	0.8675	0.4416	0.2473

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.K. Warner et al. J. Am. Chem. Soc. (1992) · doi:10.1021/ja00041a027

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.263_Fe2PO5.mcif from MAGNDATA · entry page

sha256 of this copy: 5594bd0a26487b05bb19ef0dc8b2ef1906b3763ce2ef0e414c6fa9722b8e9c62
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.263_Fe2PO5.mcif.