Research/Sitter/MAGNDATA / 0.194_UPt2Si2.mcif

UPt₂Si₂

MAGNDATA entry 0.194 · 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 ≤ 35 K (−238 °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 4.1999 · b 4.1999 · c 9.6456 Å · α 90° · β 90° · γ 90°
Transition	35 K (−238 °C)
Measured at	4.2 K
Magnetic ions	U
Largest moment component	1.67 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 · 5 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
U1	U	0.25	0.25	0.7477	0	0	1.67	1.67
Pt1	Pt	0.25	0.25	0.3769
Pt2	Pt	0.75	0.25	0
Si1	Si	0.25	0.25	0.127
Si2	Si	0.75	0.25	0.5

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.A. Steeman et al. J. Phys.: Condens. Matter (1990) · doi:10.1088/0953-8984/2/18/003

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.194_UPt2Si2.mcif from MAGNDATA · entry page

sha256 of this copy: a57b1d690c363ae7987a612e3818c19b58f7111177bb639051856d23c1321d33
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.194_UPt2Si2.mcif.