Research/Sitter/MAGNDATA / 1.1.96_DyNiAl4.mcif

DyNiAl₄

MAGNDATA entry 1.1.96 · 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 ≤ 20.2 K (−253 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	C2/c1′(α0γ)00s
Point group	2/m1′
Parent space group	C m c m No. 63
Repeats every	0.85 cells along a (not a whole number: that's what incommensurate means)
Propagation	[1.1745 0 0.0313] 1k
Cell	a 4.0392 · b 15.312 · c 6.5865 Å · α 90° · β 90° · γ 90°
Transition	20.2 K (−253 °C)
Measured at	16.1 K
Magnetic ions	Dy
Largest moment component	6.7 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 C2/c1′(α0γ)00s →

Atom sites · 5 sites · CSV

site	element	y	z
Dy1	Dy	0.118	0.25
Ni1	Ni	0.772	0.25
Al1	Al	0.5	0
Al2	Al	0.929	0.25
Al3	Al	0.311	0.061

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

R. White et al. Journal of Magnetism and Magnetic Materials (2019) · doi:10.1016/j.jmmm.2018.08.011

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.96_DyNiAl4.mcif from MAGNDATA · entry page

sha256 of this copy: e05ef1db9dd90c4570fe55ce1c33b1a17d5aa27631ea015da67d5358a7a4ef89
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.96_DyNiAl4.mcif.