Research/Sitter/MAGNDATA / 1.254_UNiGa5.mcif

UNiGa₅

MAGNDATA entry 1.254 · 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 ≤ 86 K (−187 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	I_c 4/m c m BNS 140.550
Parent space group	P 4/m m m No. 123
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/2 1/2 1/2] 1k
Cell	a 8.4492 · b 8.4492 · c 13.5502 Å · α 90° · β 90° · γ 90°
Transition	86 K (−187 °C)
Measured at	9 K
Magnetic ions	Ni, U
Largest moment component	0.75 μ_B
Method	NPD, NSD

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 I_c 4/m c m →

Atom sites · 4 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
U1	U	0	0	0	0	0	0.75	0.75
Ni1	Ni	0	0	0.25
Ga1	Ga	0.25	0.25	0
Ga2	Ga	0	0.25	0.1535

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. Kaneko et al. Phys. Rev. B (2003) · doi:10.1103/PhysRevB.68.214419

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.254_UNiGa5.mcif from MAGNDATA · entry page

sha256 of this copy: 633a7962e6b832c5367b8a3b9fd6c1fd0ebfec851d72531cceb63925c9c71c01
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.254_UNiGa5.mcif.