Research/Sitter/MAGNDATA / 1.1.19_UPtGe.mcif

UPtGe

MAGNDATA entry 1.1.19 · source

incommensurate spiral

Incommensurate: the magnetic pattern repeats every so many cells, but not a whole number of them, so it never lines up with the crystal lattice. Here it's a spiral: the spin direction rotates as you move along.

ordered ≤ 50 K (−223 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	Imm21′(α00)0s0s
Point group	mm21′
Parent space group	I m m 2 No. 44
Repeats every	1.81 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.554 0 0] 1k
Cell	a 4.32 · b 7.17 · c 7.5 Å · α 90° · β 90° · γ 90°
Transition	50 K (−223 °C)
Measured at	4.2 K
Magnetic ions	U
Largest moment component	1.8 μ_B
Method	NSD and polarized neutron diffraction

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 Imm21′(α00)0s0s →

Atom sites · 4 sites · CSV

site	element	y	z
U1	U	0	0.625
U2	U	0.5	0.686
Pt1	Pt	0.7217	0.314
Ge1	Ge	0.206	0.984

Incommensurate: the moments are modulated; the picture evaluates each atom's Fourier series at its own phase.

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

D. Mannix et al. PHYSICAL REVIEW B (2000) · doi:10.1103/PhysRevB.62.3801

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.19_UPtGe.mcif from MAGNDATA · entry page

sha256 of this copy: ebb92b250fca7a13641c50b8f9ee592de9f4bd3cb4524d04b2f8b708e1ff6649
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.19_UPtGe.mcif.