Research/Sitter/MAGNDATA / 0.514_CoFe3O5.mcif

CoFe₃O₅

MAGNDATA entry 0.514 · 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 ≤ 300 K (27 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C m′c m′ BNS 63.464
Parent space group	C m c m No. 63
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 2.90423 · b 9.77325 · c 12.58173 Å · α 90° · β 90° · γ 90°
Transition	300 K (27 °C)
Measured at	250 K
Magnetic ions	Fe
Largest moment component	2.54 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 m′ →

Atom sites · 8 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Fe1	Fe	0.5	0.2393	0.1159	0	0	2.54	2.54
Fe2	Fe	0	0	0	0	0	−2.21	2.21
Fe3	Fe	0	0.4915	0.25
Co2	Co	0	0	0
Co3	Co	0	0.4915	0.25
O1	O	0.5	0.3352	0.25
O2	O	0	0.36	0.0448
O3	O	0	0.0923	0.1422

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

K.H. Hong et al. Inorg. Chem. (2018) · doi:10.1021/acs.inorgchem.8b02458

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.514_CoFe3O5.mcif from MAGNDATA · entry page

sha256 of this copy: 14a9ccc01b74e2e6baaa05e425f0087519d066380bdd7d8bc8d39fb611a0238d
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.514_CoFe3O5.mcif.