Research/Sitter/MAGNDATA / 1.728_Tm3Cu4Sn4.mcif

Tm₃Cu₄Sn₄

MAGNDATA entry 1.728 · 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 ≤ 2.8 K (−270 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	C_c 2/m BNS 12.63
Point group	2/m1′
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 16.0856 · b 4.3838 · c 13.771 Å · α 90° · β 115.98° · γ 90°
Transition	2.8 K (−270 °C)
Measured at	2 K
Magnetic ions	Tm
Largest moment component	5.98 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)
Tm1	Tm	0	0.25	0	5.98	0	5.98
Tm2	Tm	0.1301	0.0602
Cu1	Cu	0.3177	0.2569
Cu2	Cu	0.3397	0.0766
Sn1	Sn	0.2151	0.3654
Sn2	Sn	0.5104	0.1009

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. J. Phys.: Condens. Matter (2013) · doi:10.1088/0953-8984/25/6/066012

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.728_Tm3Cu4Sn4.mcif from MAGNDATA · entry page

sha256 of this copy: 369cb01d0cca8869886d00aa08a8df077ad5f8c50f9cfb2966af5c1882f2cbaa
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.728_Tm3Cu4Sn4.mcif.