Research/Sitter/MAGNDATA / 1.1.32_HoMgPb.mcif

HoMgPb

MAGNDATA entry 1.1.32 · 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 ≤ 19 K (−254 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	I2/m1′(αβ0)00s
Point group	2/m1′
Parent space group	I 4/m m m No. 139
Repeats every	1.2 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.835 0 0] 1k
Cell	a 4.383 · b 4.383 · c 15.856 Å · α 90° · β 90° · γ 90°
Transition	19 K (−254 °C)
Measured at	2 K
Magnetic ions	Ho
Largest moment component	8.9 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 I2/m1′(αβ0)00s →

Atom sites · 4 sites · CSV

site	element	x	y	z
Ho1_1	Ho	0	0	0.334
Mg1_1	Mg	0	0.5	0
Mg2_1	Mg	−0.5	0	0
Pb1_1	Pb	0	0	0.139

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

Lemoine, P. et al. Journal of Magnetism and Magnetic Materials (2012) · doi:10.1016/j.jmmm.2012.03.037

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.32_HoMgPb.mcif from MAGNDATA · entry page

sha256 of this copy: 9b2348c1d7f6333415927b68ca326ba06d016e925449023f063b0d603066dffe
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.32_HoMgPb.mcif.