Research/Sitter/MAGNDATA / 0.468_ErB4.mcif

ErB₄

MAGNDATA entry 0.468 · 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 ≤ 13.2 K (−260 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P b′ a m BNS 55.355
Parent space group	P 4/m b m No. 127
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 7.071 · b 7.071 · c 4 Å · α 90° · β 90° · γ 90°
Transition	13.2 K (−260 °C)
Measured at	4.2 K
Magnetic ions	Er
Largest moment component	8.2 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 P b′ a m →

Atom sites · 5 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Er1	Er	0.3183	0.8183	0	0	0	8.2	8.2
B1	B	0	0	0.2031
B2	B	0.0859	0.5859	0.5
B3_1	B	0.1767	0.0382	0.5
B3_2	B	0.9618	0.1767	0.5

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. Will et al. Journal of the Less-Common Metals (1981) · doi:10.1016/0022-5088(81)90238-1

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.468_ErB4.mcif from MAGNDATA · entry page

sha256 of this copy: d5dda813ec7841eb9741c4a3a83032ca29b43dcc53f599f29836b3c1c02379a4
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.468_ErB4.mcif.