Research/Sitter/MAGNDATA / 0.651_Er3Cu4Sn4.mcif

Er₃Cu₄Sn₄

MAGNDATA entry 0.651 · 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 ≤ 6 K (−267 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C_c 2/m BNS 12.63
Parent space group	C 2/m No. 12
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 1/2] 1k
Cell	a 16.0831 · b 4.3887 · c 13.7464 Å · α 90° · β 115.75° · γ 90°
Transition	6 K (−267 °C)
Measured at	3.7 K
Magnetic ions	Er
Largest moment component	8.86 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_c 2/m →

Atom sites · 6 sites · CSV

site	element	x	z	m_a	m_b	m_c	\|m\| (μ_B)
Er1	Er	0	0.25	0	8.86	0	8.86
Er2	Er	0.129	0.0585
Cu1	Cu	0.321	0.259
Cu2	Cu	0.338	0.076
Sn1	Sn	0.216	0.3655
Sn2	Sn	0.506	0.104

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/S205252062100127X

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.651_Er3Cu4Sn4.mcif from MAGNDATA · entry page

sha256 of this copy: cf35b90694896ee3b44b5a3a2c2522e9cbc12e12a6704b3a7b428403f4a00e7a
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.651_Er3Cu4Sn4.mcif.