Evidence of Incoherent Carriers Associated with Resonant Impurity Levels and Their Influence on Superconductivity in the Anomalous Superconductor Pb1xTlxTe

P. Giraldo-Gallo, P. Walmsley, B. Sangiorgio, S. C. Riggs, R. D. McDonald, L. Buchauer, B. Fauqué, Chang Liu, N. A. Spaldin, A. Kaminski, K. Behnia, and I. R. Fisher
Phys. Rev. Lett. 121, 207001 – Published 13 November 2018
PDFHTMLExport Citation

Abstract

We present a combined experimental and theoretical study of the evolution of the Fermi surface of the anomalous superconductor Pb1xTlxTe 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 Pb1xTlxTe, and we rule out the presence of an additional valence band maximum at the Fermi energy. A comparison to nonsuperconducting Pb1xNaxTe 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.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 15 November 2017

DOI:https://doi.org/10.1103/PhysRevLett.121.207001

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

P. Giraldo-Gallo1,2,3, P. Walmsley4, B. Sangiorgio5, S. C. Riggs2, R. D. McDonald6, L. Buchauer7, B. Fauqué7, Chang Liu8, N. A. Spaldin5, A. Kaminski8, K. Behnia7, and I. R. Fisher4

  • 1Geballe Laboratory for Advanced Materials and Department of Physics, Stanford University, Stanford, California 94305, USA
  • 2National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
  • 3Department of Physics, Universidad de Los Andes, Bogotá 111711, Colombia
  • 4Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, California 94305, USA
  • 5Materials Theory, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zürich, Switzerland
  • 6Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 7LPEM (UPMC-CNRS), Ecole Superieure de Physique et de Chimie Industrielles, Rue Vauquelin, 75005 Paris, France
  • 8Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 121, Iss. 20 — 16 November 2018

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×