Research/Sitter/MAGNDATA / 0.66_Fe2O3-alpha.mcif

Fe₂O₃-alpha

MAGNDATA entry 0.66 · source

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.

Spin group ¹3̄²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 259.1 K (−14 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P 1 BNS 2.4
Point group	1
Parent space group	R 3c No. 167
Spins	collinear · 3 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 5.034171 · b 5.034171 · c 13.7321 Å · α 90° · β 90° · γ 120°
Transition	259.1 K (−14 °C)
Measured at	10 K
Magnetic ions	Fe
Largest moment component	4.149 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 1 →

Atom sites · 5 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Fe1_1	Fe	0	0	0.3551	0.781	0	4.149	4.2219
Fe1_2	Fe	0	0	0.1449	−0.781	0	−4.149	4.2219
O1_1	O	0.306	0	0.25
O1_2	O	0	0.306	0.25
O1_3	O	0.694	0.694	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

A.H. Hill et al. Chem. Mater. (2008) · doi:10.1021/cm800009s

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.66_Fe2O3-alpha.mcif from MAGNDATA · entry page

sha256 of this copy: ca9971306990b7efa65deb431d5c51e5ab33f2565ca13b8a98e97e9ffee35be4
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.66_Fe2O3-alpha.mcif.