Research/Sitter/MAGNDATA / 1.727_Tm3Cu4Ge4.mcif

Tm₃Cu₄Ge₄

MAGNDATA entry 1.727 · 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 ≤ 2.8 K (−270 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P_a n m a BNS 62.450
Point group	mmm1′
Parent space group	I m m m No. 71
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 1/2 0] 1k
Cell	a 13.7176 · b 13.1928 · c 4.1321 Å · α 90° · β 90° · γ 90°
Transition	2.8 K (−270 °C)
Measured at	2.4 K
Magnetic ions	Tm
Largest moment component	5.7 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_a n m a →

Atom sites · 7 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Tm1	Tm	0.5	0	0.5	0	0	5.7	5.7
Tm2	Tm	0.1299	0	0
Cu1_1	Cu	0.3297	0.0959	0
Cu1_2	Cu	0.6703	0.9042	0
Ge1	Ge	0.2174	0.25	0
Ge2_1	Ge	0	0.0948	0.5
Ge2_2	Ge	0	0.9052	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

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

⬇ 1.727_Tm3Cu4Ge4.mcif from MAGNDATA · entry page

sha256 of this copy: 8b8a190ccaf00d84d6acb8892250de01a5ad326011f80626bb9371ce7237153e
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.727_Tm3Cu4Ge4.mcif.