Research/Sitter/MAGNDATA / 1.400_TbAg2.mcif

TbAg₂

MAGNDATA entry 1.400 · 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 ≤ 35 K (−238 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C_A m c a BNS 64.480
Parent space group	I 4/m m m No. 139
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/2 -1/2 0] 1k
Cell	a 5.2467 · b 5.2467 · c 9.247 Å · α 90° · β 90° · γ 90°
Transition	35 K (−238 °C)
Measured at	5 K
Magnetic ions	Tb
Largest moment component	8.95 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 · 2 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Tb1	Tb	0	0	0	0	0	8.95	8.95
Ag1	Ag	0	0	0.325

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

M. Atoji et al. THE JOURNAL OF CHEMICAL PHYSICS (1968) · doi:10.1063/1.1669629

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.400_TbAg2.mcif from MAGNDATA · entry page

sha256 of this copy: 0cff40b4acc55f72ace0867e7ed9a03b783e36fc78c88ed93b19b82935f920bf
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.400_TbAg2.mcif.