Research/Sitter/MAGNDATA / 0.260_CuFePO5.mcif

CuFePO₅

MAGNDATA entry 0.260 · 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 ≤ 195 K (−78 °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 7.5152 · b 6.3948 · c 7.1716 Å · α 90° · β 90° · γ 90°
Transition	195 K (−78 °C)
Measured at	1.4 K
Magnetic ions	Cu, Fe
Largest moment component	4.28 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)
Cu1	Cu	0	0	0	0	0.95	0	0.95
Fe1	Fe	0.1732	0.25	0.7123	0	4.28	0	4.28
P1	P	0.389	0.25	0.1308
O1	O	0.4114	0.25	0.6308
O2	O	0.2306	0.25	0.9968
O3	O	0.0657	0.25	0.4709
O4	O	0.375	0.0564	0.2589

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

N.E. Khayati et al. 93582 (2001) · doi:10.1007/s100510170093

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.260_CuFePO5.mcif from MAGNDATA · entry page

sha256 of this copy: 5cf1c0a78046483eadfe9f9218c4dae174ada79b03e21b7a3214e4bb807f8e9c
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.260_CuFePO5.mcif.