Superconducting Tc enhancement due to negative-U impurities: Monte Carlo study of a local exciton model

H.- B. Schüttler; M. Jarrell; D. J. Scalapino

doi:10.1103/PhysRevB.39.6501

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Superconducting Tc enhancement due to negative-U impurities: Monte Carlo study of a local exciton model

H.- B. Schüttler, M. Jarrell, D. J. Scalapino

DOI 10.1103/PhysRevB.39.6501 · Physical Review B

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Abstract

The enhancement of superconductivity by a small concentration of excitonic negative-U centers is studied by a new method which combines diagrammatic perturbation theory and Monte Carlo simulation. Results are given which show how the impurity parameters should be selected in order to obtain the maximum increase in the superconducting transition temperature Tc. We also discuss the underlying physics of these results.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
PbTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown