Research/Sitter/MAGNDATA / 1.1.135_Dy.mcif

Dy

MAGNDATA entry 1.1.135 · 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 ≤ 179 K (−94 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P6₃221′(0,0,γ)h00s
Point group	6221′
Parent space group	P 6₃/m m c No. 194
Repeats every	6.67 cells along c (not a whole number: that's what incommensurate means)
Propagation	[0 0 0.15] 1k
Cell	a 3.5903 · b 3.5903 · c 5.6475 Å · α 90° · β 90° · γ 120°
Transition	179 K (−94 °C)
Measured at	100 K
Magnetic ions	Dy
Largest moment component	10.9697 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 P6₃221′(0,0,γ)h00s →

Atom sites · 1 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Dy1	Dy	0.3333	0.6667	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

M. K. Wilkinson et al. Journal of Applied Physics (1961) · doi:10.1063/1.2000493

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.135_Dy.mcif from MAGNDATA · entry page

sha256 of this copy: 78a70a075cd2240674d5500474a226b21083b2a0fb63752571ae7067ddef4fcb
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.135_Dy.mcif.