Publication Date

11-13-2018

Department

Ames Laboratory; Physics and Astronomy

Campus Units

Physics and Astronomy, Ames Laboratory

OSTI ID+

1487219

Report Number

IS-J 9824

DOI

10.1103/PhysRevLett.121.207001

Journal Title

Physical Review Letters

Volume Number

121

Issue Number

20

First Page

207001

Abstract

We present a combined experimental and theoretical study of the evolution of the Fermi surface of the anomalous superconductor Pb1-xTlxTe as a function of thallium concentration, drawing on a combination of magnetotransport measurements (Shubnikov-de Haas oscillations and the Hall coefficient), angle resolved photoemission spectroscopy, and density functional theory calculations of the electronic structure. Our results indicate that for Tl concentrations beyond a critical value, the Fermi energy coincides with resonant impurity states in Pb1-xTlxTe, and we rule out the presence of an additional valence band maximum at the Fermi energy. A comparison to nonsuperconducting Pb1-xNaxTe implies that the presence of these impurity states at the Fermi energy provides the enhanced pairing interaction and thus also the anomalously high temperature superconductivity in this material.

DOE Contract Number(s)

FA9550-09-1-0583; 291151; DMR-1157490; AC02-05CH11231; AC02-07CH11358; 228043; 89233218CNA000001

Language

en

Department of Energy Subject Categories

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Publisher

Iowa State University Digital Repository, Ames IA (United States)

Share

COinS