Research/Sitter/MAGNDATA / 1.215_UP2.mcif

UP₂

MAGNDATA entry 1.215 · 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 ≤ 203 K (−70 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 9 properties

Magnetic group	P_c4/ncc BNS 130.432
Parent space group	P 4/n m m No. 129
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 1/2] 1k
Cell	a 3.81 · b 3.81 · c 15.528 Å · α 90° · β 90° · γ 90°
Transition	203 K (−70 °C)
Magnetic ions	U
Largest moment component	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_c4/ncc →

Atom sites · 3 sites · CSV

site	element	x	z	m_a	m_b	m_c	\|m\| (μ_B)
U1	U	0	0.14	0	0	1	1
P1	P	0.5	0
P2	P	0	0.3175

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

R. Troc et al. Phys. Stat. Sol. (1966) · doi:10.1002/pssb.19660150211

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.215_UP2.mcif from MAGNDATA · entry page

sha256 of this copy: 97620c2801fb294d59587a56b6abaef81879fa6a2ef070576f046baed9cb520f
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.215_UP2.mcif.