Research/Sitter/MAGNDATA / 1.1.42_YbCo2Si2.mcif

YbCo₂Si₂

MAGNDATA entry 1.1.42 · 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 ≤ 1.4 K (−272 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	I112/m1′(αβ0)000ss
Point group	2/m1′
Parent space group	I 4/m m m No. 139
Repeats every	1.33 cells along a (not a whole number: that's what incommensurate means)
Propagation	[-0.75 0.086 0] 1k
Cell	a 3.8533 · b 3.8533 · c 9.6777 Å · α 90° · β 90° · γ 90°
Transition	1.4 K (−272 °C)
Measured at	1.1 K
Magnetic ions	Yb
Largest moment component	1.12 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 I112/m1′(αβ0)000ss →

Atom sites · 3 sites · CSV

site	element	y	z
Yb1	Yb	0	0
Co1	Co	0.5	0.25
Si1	Si	0	0.38

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

N. Mufti et al. PHYSICAL REVIEW B (2016) · doi:10.1103/PhysRevB.94.045116

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.42_YbCo2Si2.mcif from MAGNDATA · entry page

sha256 of this copy: 3229f39cff0aca738bc040660a7051413e66f08b64f3d781c2ab74928b57d7dc
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.42_YbCo2Si2.mcif.