Research/Sitter/MAGNDATA / 1.1.146_Ho7Rh3.mcif

Ho₇Rh₃

MAGNDATA entry 1.1.146 · 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 ≤ 32 K (−241 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	Cmc211′(00γ)0sss
Point group	mm21′
Parent space group	P6₃ m c No. 186
Repeats every	2.57 cells along c (not a whole number: that's what incommensurate means)
Propagation	[0 0 -0.389169] 1k
Cell	a 9.6963 · b 16.7945 · c 6.089 Å · α 90° · β 90° · γ 90°
Transition	32 K (−241 °C)
Measured at	28 K
Magnetic ions	Ho
Largest moment component	7.5 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 Cmc211′(00γ)0sss →

Atom sites · 7 sites · CSV

site	element	x	y	z
Ho1	Ho	0.5	0.1667	−0.021
Ho2_1	Ho	−0.3134	0.4378	−0.3244
Ho2_2	Ho	−0.5	−0.3756	−0.3244
Ho3_1	Ho	0.1887	0.2704	−0.0271
Ho3_2	Ho	−0.5	−0.0409	−0.0271
Rh1_1	Rh	0.7183	0.0939	−0.2614
Rh1_2	Rh	−0.5	0.3122	−0.2614

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

A. F. Gubkin et al. PHYSICAL REVIEW B (2022) · doi:10.1103/PhysRevB.106.134419

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.146_Ho7Rh3.mcif from MAGNDATA · entry page

sha256 of this copy: 65337da031f7d40815fc2b3c059fe8fdc8a133ceff6aab9ff0486508bb530358
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.146_Ho7Rh3.mcif.