Evidence of Incoherent Carriers Associated with Resonant Impurity Levels and Their Influence on Superconductivity in the Anomalous Superconductor Pb1−xTlxTe
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, I. R. Fisher
DOI 10.1103/PhysRevLett.121.207001 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb1-xTlxTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Pb1-xNaxTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.01 | Pressure not reported | unknown |
Similar papers
Correlation of anomalous normal state properties with superconductivity in Pb1−x−yTlxInyTe
similarity 0.94A. S. Erickson et al.
Source status unknown — claims are unverified
Enhanced superconducting pairing interaction in indium-doped tin telluride
similarity 0.94A. S. Erickson et al.
Source status unknown — claims are unverified
Evidence of incoherent carriers associated with resonant impurity levels and their influence on superconductivity in the anomalous superconductor PbTlTe
similarity 0.93P. Giraldo-Gallo et al. · 2017 · arXiv:1711.05723
Source status unknown — claims are unverified
Direct spectroscopic evidence for mixed-valence Tl in the low carrier-density superconductor Pb1−xTlxTe
similarity 0.93P. Walmsley et al.
Source status unknown — claims are unverified
Optical evidence of an enhanced electronic effective mass in the anomalous Pb1−xTlxTe superconductor
similarity 0.92A. Pal et al.
Source status unknown — claims are unverified
Superconductivity by alloying the topological insulator SnBi2Te4
similarity 0.92Michael A. McGuire et al.
Source status unknown — claims are unverified