Research/Sitter/MAGNDATA / 1.1.47_Tb3Ni.mcif

Ni₁Tb₃

MAGNDATA entry 1.1.47 · 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 ≤ 61 K (−212 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P1121/a1′(αβ0)0ss
Point group	2/m1′
Parent space group	P n m a No. 62
Repeats every	1.98 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.506 0.299 0] 1k
Cell	a 6.8342 · b 9.5262 · c 6.3306 Å · α 90° · β 90° · γ 90°
Transition	61 K (−212 °C)
Measured at	58 K
Magnetic ions	Tb
Largest moment component	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 P1121/a1′(αβ0)0ss →

Atom sites · 4 sites · CSV

site	element	x	y	z
Ni1	Ni	0.3918	0.25	0.5531
Tb1	Tb	0.0309	0.25	0.3562
Tb2_1	Tb	0.18	0.0651	0.8209
Tb2_2	Tb	0.82	0.5651	0.1791

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 (2018) · doi:10.1103/PhysRevB.97.134425

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.47_Tb3Ni.mcif from MAGNDATA · entry page

sha256 of this copy: df4b739bcb995734c2bd1195e8ea3d5265d9ba397204aebd877570096d963ab6
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.47_Tb3Ni.mcif.

Ni1Tb3

Symmetry

Source

Original file

Ni₁Tb₃