Research/Sitter/MAGNDATA / 1.0.43_UPd2Si2.mcif

UPd₂Si₂

MAGNDATA entry 1.0.43 · source

s-wave compensated ferrimagnet

Opposite moments cancel, but the two sublattices aren't related by any symmetry, so the bands split like a ferromagnet's (s-wave).

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

ordered ≤ 150 K (−123 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	I 4/m m′ m′ BNS 139.537
Parent space group	I 4/m m m No. 139
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 2/3] 1k
Cell	a 4.097 · b 4.097 · c 30.138 Å · α 90° · β 90° · γ 90°
Transition	150 K (−123 °C)
Measured at	80 K
Magnetic ions	U
Largest moment component	2.55 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 I 4/m m′ m′ →

Atom sites · 7 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Pd1_1	Pd	0	0.5	0.0833
Pd1_2	Pd	0.5	0	0.25
U1_1	U	0	0	0	0	0	2.55	2.55
U1_2	U	0.5	0.5	0.1667	0	0	−1.275	1.275
Si1_1	Si	0	0	0.1272
Si1_2	Si	0.5	0.5	0.2939
Si1_3	Si	0.5	0.5	0.0395

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

H Ptasiewicz-Bak et al. J. Phys. F: Met. Phys. (1981) · doi:10.1088/0305-4608/11/6/009

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.0.43_UPd2Si2.mcif from MAGNDATA · entry page

sha256 of this copy: 7d96a619852b0a830d81e125e06ecda9a800b8610cfa7ed9bbb423466988b442
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.0.43_UPd2Si2.mcif.