Research/Sitter/MAGNDATA / 1.1.60_TmNi2B2C.mcif

TmNi₂B₂C

MAGNDATA entry 1.1.60 · 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 ≤ 1.5 K (−272 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	Fmmm1′(α00)0s0s
Point group	mmm1′
Parent space group	I 4/m m m No. 139
Repeats every	10.75 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.093 0.093 0] 1k
Cell	a 3.4866 · b 3.4866 · c 10.586 Å · α 90° · β 90° · γ 90°
Transition	1.53 K (−272 °C)
Measured at	0.5 K
Magnetic ions	Tm
Largest moment component	4.81 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 Fmmm1′(α00)0s0s →

Atom sites · 4 sites · CSV

site	element	x	y	z
Tm1	Tm	0	0	0
Ni1	Ni	0.5	0	0.25
B1	B	0	0	0.3598
C1	C	0.5	0.5	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

J.W. Lynn et al. PHYSICAL REVIEW B (1997) · doi:10.1103/PhysRevB.55.6584

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.60_TmNi2B2C.mcif from MAGNDATA · entry page

sha256 of this copy: 5c22f40425cfa22d7e91ff60d6397e6fe3f2603fd0956593ee701593ad4d791c
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.60_TmNi2B2C.mcif.