Research/Sitter/MAGNDATA / 0.331_Fe2Mo3O8.mcif

Fe₂Mo₃O₈

MAGNDATA entry 0.331 · source

g-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. g-wave: 4 nodal planes.

Spin group ²6/²m¹m²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 59 K (−214 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P 6₃′ m′ c BNS 186.205
Parent space group	P 6₃ m c No. 186
Spins	collinear · 4 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 5.777 · b 5.777 · c 10.057 Å · α 90° · β 90° · γ 120°
Transition	59 K (−214 °C)
Measured at	4.2 K
Magnetic ions	Fe
Largest moment component	4.6 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 6₃′ m′ c →

Atom sites · 7 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Fe1	Fe	0.3333	0.6667	0.957	0	0	4.6	4.6
Fe2	Fe	0.3333	0.6667	0.512	0	0	4.6	4.6
Mo1	Mo	0.144	0.856	0.25
O1	O	0	0	0.393
O2	O	0.3333	0.6667	0.144
O3	O	0.488	0.512	0.361
O4	O	0.175	0.825	0.63

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

D. Bertrand et al. J. Physique (1975) · doi:10.1051/jphys:01975003605037900

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.331_Fe2Mo3O8.mcif from MAGNDATA · entry page

sha256 of this copy: ce6cfd75818007f8535dabede61e161d703867c652d3277e47640c27e9255146
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.331_Fe2Mo3O8.mcif.