Research/Sitter/MAGNDATA / 0.112_FeBO3.mcif

FeBO₃

MAGNDATA entry 0.112 · 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 ≤ 348 K (75 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	C 2′/c′ BNS 15.89
Point group	2′/m′
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 4.626 · b 4.626 · c 14.493 Å · α 90° · β 90° · γ 120°
Transition	348 K (75 °C)
Measured at	77 K
Magnetic ions	Fe
Largest moment component	4.7 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 2′/c′ →

Atom sites · 4 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Fe1	Fe	0	0	0	4.7	0	0	4.7
B1	B	0	0	0.25
O1_1	O	0.2981	0	0.25
O1_2	O	0	0.2981	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

M. Pernet et al. Solid State Commun. (1970) · doi:10.1016/0038-1098(70)90469-2

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.112_FeBO3.mcif from MAGNDATA · entry page

sha256 of this copy: cbd42f73289456c19a75912aa46669cdaa41b59db32f386f7778b3e4a027cd51
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.112_FeBO3.mcif.