Research/Sitter/MAGNDATA / 1.1.70_TmMnO3.mcif

TmMnO₃

MAGNDATA entry 1.1.70 · 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 ≤ 40 K (−233 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	Pnma1′(α00)00ss
Point group	mmm1′
Parent space group	P n m a No. 62
Repeats every	2.22 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.45 0 0] 1k
Cell	a 5.8157 · b 7.3218 · c 5.231 Å · α 90° · β 90° · γ 90°
Transition	40 K (−233 °C)
Measured at	35 K
Magnetic ions	Mn, Tm
Largest moment component	2.98 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 Pnma1′(α00)00ss →

Atom sites · 4 sites · CSV

site	element	x	y	z
Tm1	Tm	0.085	0.25	0.982
Mn1	Mn	0	0	0.5
O1	O	0.468	0.25	0.111
O2	O	0.326	0.056	0.704

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

V.Y. Pomjakushin et al. New Journal of Physics (2009) · doi:10.1088/1367-2630/11/4/043019

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.70_TmMnO3.mcif from MAGNDATA · entry page

sha256 of this copy: 925fb57555cc10ef9aa2e33756ad2b0ca402c552ecdf3b524b7c0dc3b5dab7c6
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.70_TmMnO3.mcif.