Research/Sitter/MAGNDATA / 1.1.133_NdOs2Al10.mcif

NdOs₂Al₁₀

MAGNDATA entry 1.1.133 · 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 ≤ 2.2 K (−271 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	Cmcm1′(0,β,0)00ss
Point group	mmm1′
Parent space group	C m c m No. 63
Repeats every	1.38 cells along b (not a whole number: that's what incommensurate means)
Propagation	[0 0.7229 0] 1k
Cell	a 9.109 · b 10.222 · c 9.141 Å · α 90° · β 90° · γ 90°
Transition	2.2 K (−271 °C)
Measured at	1.6 K
Magnetic ions	Nd
Largest moment component	1.45 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 Cmcm1′(0,β,0)00ss →

Atom sites · 7 sites · CSV

site	element	x	y	z
Nd1_1	Nd	0	0.127	0.25
Os1_1	Os	0.25	0.25	0
Al3_1	Al	0.216	0.3638	0.25
Al1_1	Al	0.3534	0.1331	0.25
Al4_1	Al	0	0.1559	0.5963
Al2_1	Al	0	0.3784	0.0504
Al5_1	Al	0.2199	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

C. Ritter et al. J. Phys.: Condens. Matter (2021) · doi:10.1088/1361-648X/abee3b

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.133_NdOs2Al10.mcif from MAGNDATA · entry page

sha256 of this copy: 7a5754d8cc70abc0f25acf8d79afead36c6526d4b1c3c11c65bafa3a3a400004
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.133_NdOs2Al10.mcif.