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

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), angl...

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Published in:Physical review letters 2018-11, Vol.121 (20), p.207001
Main Authors: Giraldo-Gallo, P, Walmsley, P, Sangiorgio, B, Riggs, S C, McDonald, R D, Buchauer, L, Fauqué, B, Liu, Chang, Spaldin, N A, Kaminski, A, Behnia, K, Fisher, I R
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Language:English
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CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Density functional theory
Electronic structure
Fermi surfaces
Hall effect
High temperature
Impurities
Photoelectric emission
Superconductivity
Thallium
Valence band
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container_issue 20
container_start_page 207001
container_title Physical review letters
container_volume 121
creator Giraldo-Gallo, P
Walmsley, P
Sangiorgio, B
Riggs, S C
McDonald, R D
Buchauer, L
Fauqué, B
Liu, Chang
Spaldin, N A
Kaminski, A
Behnia, K
Fisher, I R
description 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.
doi_str_mv 10.1103/PhysRevLett.121.207001
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source American Physical Society:Jisc Collections:APS Read and Publish 2023-2025 (reading list)
subjects CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Density functional theory
Electronic structure
Fermi surfaces
Hall effect
High temperature
Impurities
Photoelectric emission
Superconductivity
Thallium
Valence band
title Evidence of Incoherent Carriers Associated with Resonant Impurity Levels and Their Influence on Superconductivity in the Anomalous Superconductor Pb1−xTlxTe
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