Superconductivity in Ba_2Sn_3Sb_6 and SrSn_3Sb_4

TL;DR

This study reports the discovery of superconductivity at 3.9 K in the Zintl compounds Ba2Sn3Sb6 and SrSn3Sb4, supported by resistivity and magnetic susceptibility measurements showing the Meissner effect.

Contribution

First demonstration of superconductivity in Ba2Sn3Sb6 and SrSn3Sb4, expanding the understanding of Zintl compounds and their electronic properties.

Findings

Superconducting transition at 3.9 K in both compounds

Observation of the Meissner effect in Ba2Sn3Sb6

Presence of conduction electrons and lone pairs related to superconductivity

Abstract

Resistivity and ac magnetic susceptibility measurements on Ba2Sn3Sb6 and SrSn3Sb4 indicate that these Zintl compounds display a transition to a superconducting phase at Tc = 3.9 K. The Meissner effect was observed for Ba2Sn3Sb6 under an applied field of 25 Oe. The signatures for superconductivity, such as high and low velocity conduction electrons and lone pairs, are present for both of these compounds.