Research/Sitter/MAGNDATA / 1.1.112_YbNi2Si2.mcif

YbNi₂Si₂

MAGNDATA entry 1.1.112 · 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 ≤ 2.3 K (−271 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	I4221′(0,0,γ)q00s
Point group	4221′
Parent space group	I 4/m m m No. 139
Repeats every	1.25 cells along c (not a whole number: that's what incommensurate means)
Propagation	[0 0 0.8025] 1k
Cell	a 3.9132 · b 3.9132 · c 9.518 Å · α 90° · β 90° · γ 90°
Transition	2.3 K (−271 °C)
Measured at	1.43 K
Magnetic ions	Y
Largest moment component	1.8 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 I4221′(0,0,γ)q00s →

Atom sites · 3 sites · CSV

site	element	y	z
Ni1	Ni	0.5	0.25
Si1	Si	0	0.375
Yb1	Y	0	0

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

G. Andre et al. Journal of Alloys and Compounds (1995) · doi:10.1016/0925-8388(95)01545-0

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.112_YbNi2Si2.mcif from MAGNDATA · entry page

sha256 of this copy: f5b4c9c03d6959ebf0d0805e0bed25a09462dbe528b01a699d7ef9fced5a4bf5
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.112_YbNi2Si2.mcif.