Research/Sitter/MAGNDATA / 1.738_TbNiAl.mcif

Tb₁Ni₁Al₁

MAGNDATA entry 1.738 · source

antiferromagnet

No net magnetisation, and up and down sublattices are related by a shift or by inversion, so the bands stay spin-degenerate: a conventional antiferromagnet.

Spin group ¹2/¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 47 K (−226 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	I_a m a 2 BNS 46.247
Point group	mm21′
Parent space group	P 6 2 m No. 189
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/2 0 1/2] 1k
Cell	a 13.794 · b 6.897 · c 7.952 Å · α 90° · β 90° · γ 120°
Transition	47 K (−226 °C)
Measured at	28 K
Magnetic ions	Tb
Largest moment component	7.9 μ_B
Method	See also Ehlers and Maletta, Z. Phys. B 99, 145-150 (1996)[DOI:10.1007/BF02769926]

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 I_a m a 2 →

Atom sites · 6 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Tb1_1	Tb	0.2721	0	0.25	0	0	7.9	7.9
Tb1_2	Tb	0	0.5441	0.25	0	0	1.2	1.2
Al1_1	Al	0.116	0	0
Al1_2	Al	0	0.232	0
Ni1	Ni	0	0	0.25
Ni2	Ni	0.1667	0.6667	0

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. Donni et al. J. Phys.: Condens. Matter (1996) · doi:10.1088/0953-8984/8/50/043

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.738_TbNiAl.mcif from MAGNDATA · entry page

sha256 of this copy: fbbcb577b90929be9be05c8ebae0a28fc18ca1b357f50df1a127ee16d0c8634a
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.738_TbNiAl.mcif.

Tb1Ni1Al1

Symmetry

Source

Original file

Tb₁Ni₁Al₁