Experimental Determination of the Fermi Surface of Sr3Ir4Sn13

TL;DR

This study experimentally investigates the Fermi surface of Sr3Ir4Sn13, revealing its electronic structure and confirming theoretical predictions, which aids understanding of multiband superconductivity in this material family.

Contribution

First experimental determination of the Fermi surface of Sr3Ir4Sn13, combining quantum oscillations with density functional theory calculations.

Findings

Good agreement between measurements and theory using low-temperature lattice parameters.

Fermi surface consistent with a body-centred cubic lattice of symmetry I-43d.

Results inform models of multiband superconductivity in Sr3Ir4Sn13.

Abstract

The stannide family of materials A3T4Sn13 (A = La,Sr,Ca, T = Ir,Rh) is interesting due to the interplay between a tunable lattice instability and phonon-mediated superconductivity with Tc ~ 5-7 K. In Sr3Ir4Sn13 a structural transition temperature T* ~ 147 K associated with this instability has been reported, which is believed to result from a superlattice distortion of the high temperature phase on cooling. Here we report the first experimental study of the electronic structure of a member of this material family - Sr3Ir4Sn13 through measurements of quantum oscillations and comparison with density functional theory calculations. Our measurements reveal good agreement with theory using the lattice parameters consistent with a body-centred cubic lattice of symmetry I-43d of the low temperature phase. The study of the fermiology of Sr3Ir4Sn13 we present here should help inform models of multiband superconductivity in the superconducting stannides.