Research/Sitter/MAGNDATA / 1.1.49_Dy2Co3Al9.mcif

Dy₂Co₃Al₉

MAGNDATA entry 1.1.49 · 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 ≤ 5.2 K (−268 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	C2/m1′(0βγ)0ss
Point group	2/m1′
Parent space group	Cmcm No. 63
Repeats every	3.85 cells along c (not a whole number: that's what incommensurate means)
Propagation	[0 0.06 0.26] 1k
Cell	a 12.7239 · b 7.4586 · c 9.2994 Å · α 90° · β 90° · γ 90°
Transition	5.2 K (−268 °C)
Measured at	4.5 K
Magnetic ions	Dy
Largest moment component	6.9 μ_B
Method	NSD

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/m1′(0βγ)0ss →

Atom sites · 11 sites · CSV

site	element	x	y	z
Dy1	Dy	0.3394	0.3329	0.25
Co1	Co	0.3288	0	0
Co2	Co	−0.3288	0	0.5
Co3	Co	0	0	0
Co4	Co	0	0	0.5
Al1	Al	0	0.1249	0.25
Al2	Al	0.1079	0.4459	0.25
Al3	Al	0	0.3322	0.5428
Al4	Al	0	−0.3322	1.0428
Al5	Al	0.1686	0.333	0.0717
Al6	Al	−0.1686	−0.333	0.5717

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. I. Gorbunov et al. PHYSICAL REVIEW MATERIALS (2018) · doi:10.1103/PhysRevMaterials.2.084406

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.49_Dy2Co3Al9.mcif from MAGNDATA · entry page

sha256 of this copy: 7d03b500d75ba0c6842a6be2d115ecd5eff45556881dbceaee214c4e9a5a9b9a
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.49_Dy2Co3Al9.mcif.