Research/Sitter/MAGNDATA / 1.1.137_CeCuGa3.mcif

CeCuGa₃

MAGNDATA entry 1.1.137 · source

incommensurate spin-density wave

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 spin-density wave: the size of the spin swells and shrinks as you move along.

ordered ≤ 2.4 K (−271 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	I m m 2 1′(0,0,γ)0s0s
Point group	mm21′
Parent space group	I 4 m m No. 107
Repeats every	6.76 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.148 0.148 0] 1k
Cell	a 4.245 · b 4.245 · c 10.42 Å · α 90° · β 90° · γ 90°
Transition	2.4 K (−271 °C)
Measured at	1.7 K
Magnetic ions	Ce
Largest moment component	0.67 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 I m m 2 1′(0,0,γ)0s0s →

Atom sites · 4 sites · CSV

site	element	y	z
Ce1	Ce	0	0
Cu1	Cu	0	0.6129
Ga1	Ga	0	0.3871
Ga2	Ga	0.5	0.25

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

V. K. Anand et al. PHYSICAL REVIEW B (2021) · doi:10.1103/PhysRevB.104.174438

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.137_CeCuGa3.mcif from MAGNDATA · entry page

sha256 of this copy: 84dcfba6986100361bb81b121c6332723cbb19682b8b0679b25967786cc38183
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.137_CeCuGa3.mcif.