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Evidence of Incoherent Carriers Associated with Resonant Impurity Levels and Their Influence on Superconductivity in the Anomalous Superconductor Pb1-xTlxTe

TitleEvidence of Incoherent Carriers Associated with Resonant Impurity Levels and Their Influence on Superconductivity in the Anomalous Superconductor Pb1-xTlxTe
Publication TypeJournal Article
Year of Publication2018
AuthorsGiraldo-Gallo, P, Walmsley, P, Sangiorgio, B, Riggs, SC, McDonald, RD, Buchauer, L, Fauque, B, Liu, C, Spaldin, NA, Kaminski, A, Behnia, K, Fisher, IR
JournalPhysical Review Letters
Volume121
Pagination207001
Date Published11
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberWOS:000450144400010
Keywordsaugmented-wave method, bismuthates, density-of-states, fermi-surface, p-type pbte, physics, semiconductors, srtio3
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.

DOI10.1103/PhysRevLett.121.207001
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Alternate JournalPhys. Rev. Lett.