Issue 32, 2015

Gold-rich R3Au7Sn3: establishing the interdependence between electronic features and physical properties

Abstract

Two new polar intermetallic compounds Y3Au7Sn3 (I) and Gd3Au7Sn3 (II) have been synthesized and their structures have been determined by single crystal X-ray diffraction (P63/m; Z = 2, a = 8.148(1)/8.185(3), and c = 9.394(2)/9.415(3) for I/II, respectively). They can formally be assigned to the Cu10Sn3 type and consist of parallel slabs of Sn centered, edge-sharing trigonal Au6 antiprisms connected through R3 (R = Y, Gd) triangles. Additional Au atoms reside in the centres of trigonal Au6 prisms forming Au@Au6 clusters with Au–Au distances of 2.906–2.960 Å, while the RR contacts in the R3 groups are considerably larger than the sums of their metallic radii. These exclusive structural arrangements provide alluring systems to study the synergism between strongly correlated systems, particularly, those in the structure of (II), and extensive polar intermetallic contacts, which has been inspected by measurements of the magnetic properties, heat capacities and electrical conductivities of both compounds. Gd3Au7Sn3 shows an antiferromagnetic ordering at 13 K, while Y3Au7Sn3 is a Pauli paramagnet and a downward curvature in its electrical resistivity at about 1.9 K points to a superconducting transition. DFT-based band structure calculations on R3Au7Sn3 (R = Y, Gd) account for the results of the conductivity measurements and different spin ordering models of (II) provide conclusive hints about its magnetic structure. Chemical bonding analyses of both compounds indicate that the vast majority of bonding originates from the heteroatomic Au–Gd and Au–Sn interactions, while homoatomic Au–Au bonding is evident within the Au@Au6 clusters.

Graphical abstract: Gold-rich R3Au7Sn3: establishing the interdependence between electronic features and physical properties

Supplementary files

Article information

Article type
Paper
Submitted
30 Mar 2015
Accepted
14 May 2015
First published
18 May 2015

J. Mater. Chem. C, 2015,3, 8311-8321

Author version available

Gold-rich R3Au7Sn3: establishing the interdependence between electronic features and physical properties

A. Provino, S. Steinberg, V. Smetana, R. Kulkarni, S. K. Dhar, P. Manfrinetti and A. Mudring, J. Mater. Chem. C, 2015, 3, 8311 DOI: 10.1039/C5TC00884K

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