Research/Sitter/MAGNDATA / 0.378_UBi2.mcif

UBi₂

MAGNDATA entry 0.378 · source

antiferromagnet

No net magnetisation, and up and down sublattices are related by a shift or by inversion, so the bands stay spin-degenerate: a conventional antiferromagnet.

Spin group ¹4/¹m¹m¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 183 K (−90 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P 4/n′ m′ m′ BNS 129.419
Parent space group	P 4/n m m No. 129
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 4.445 · b 4.445 · c 8.908 Å · α 90° · β 90° · γ 90°
Transition	183 K (−90 °C)
Measured at	80 K
Magnetic ions	U
Largest moment component	2.1 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 4/n′ m′ m′ →

Atom sites · 3 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Bi1	Bi	0.75	0.25	0
U1	U	0.25	0.25	0.28	0	0	2.1	2.1
Bi2	Bi	0.25	0.25	0.643

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

J. Leciejewicz et al. phys. stat. sol. (1967) · doi:10.1002/pssb.19670220224

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.378_UBi2.mcif from MAGNDATA · entry page

sha256 of this copy: f99aaf19285f045fbd4f8c441b6af26102051ba3562ebf15c058aeda6e84fb4e
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.378_UBi2.mcif.