Research/Sitter/MAGNDATA / 1.652_Tb2Ni1.78In.mcif

Tb₂Ni_1.78In

MAGNDATA entry 1.652 · 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 ¹m¹m¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 21 K (−252 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	C_a m c a BNS 64.479
Point group	mmm1′
Parent space group	P/4 m b m No. 127
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/4 1/4 1/2] 1k
Cell	a 29.3834 · b 29.3834 · c 7.33914 Å · α 90° · β 90° · γ 90°
Transition	21 K (−252 °C)
Measured at	1.6 K
Magnetic ions	Tb
Largest moment component	7.55 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 C_a m c a →

Atom sites · 8 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Tb1_1	Tb	−0.0437	0.8313	0.75	0	0	−7.55	7.55
Tb1_2	Tb	0.0437	−0.0813	0.75	0	0	7.55	7.55
Tb1_3	Tb	0.3313	0.2937	0.75	0	0	7.55	7.55
Ni1_1	Ni	0.1554	0.0304	0
Ni1_2	Ni	0.3446	0.2196	0
Ni1_3	Ni	0.2196	0.1554	0
In1_1	In	0.75	0.75	0
In1_2	In	0.125	0.125	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

S. Baran et al. Acta Cryst. B (2021) · doi:10.1107/S2052520621008179

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.652_Tb2Ni1.78In.mcif from MAGNDATA · entry page

sha256 of this copy: 514be6abdf645feb23b427e947ea3bab817348138c33d2a0309cd167127412fc
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.652_Tb2Ni1.78In.mcif.