Research/Sitter/MAGNDATA / 1.1.102_TbNiGe.mcif

TbNiGe

MAGNDATA entry 1.1.102 · 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 ≤ 17.5 K (−256 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P112₁/a1′(α,β,0)0ss
Point group	2/m1′
Parent space group	P n m a No. 62
Repeats every	1.4 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.716 0.309 0] 1k
Cell	a 6.9499 · b 4.2306 · c 7.2813 Å · α 90° · β 90° · γ 90°
Transition	17.5 K (−256 °C)
Measured at	14.65 K
Magnetic ions	Tb
Largest moment component	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 P112₁/a1′(α,β,0)0ss →

Atom sites · 3 sites · CSV

site	element	x	y	z
Ni1_1	Ni	0.1945	0.25	0.0847
Tb1_1	Tb	0	0.25	0.7071
Ge1_1	Ge	0.3055	0.25	0.4153

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

G. Andre et al. Journal of Magnetism and Magnetic Materials (1992) · doi:10.1016/0304-8853(92)90119-9

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.102_TbNiGe.mcif from MAGNDATA · entry page

sha256 of this copy: eb558cbd799e1a4ab28f4a66d102abdf1ed469ac184334bf8659843ba246eba9
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.102_TbNiGe.mcif.