Compensation driven superconductor-insulator transition

Abstract

The superconductor-insulator transition in the presence of strong compensation of dopants was recently realized in La doped YBCO. The compensation of acceptors by donors makes it possible to change independently the concentration of holes n and the total concentration of charged impurities N. We propose a theory of the superconductor-insulator phase diagram in the (N,n) plane. It exhibits interesting new features in the case of strong coupling superconductivity, where Cooper pairs are compact, non-overlapping bosons. For compact Cooper pairs the transition occurs at a significantly higher density than in the case of spatially overlapping pairs. We establish the superconductor-insulator phase diagram by studying how the potential of randomly positioned charged impurities is screened by holes or by strongly bound Cooper pairs, both in isotropic and layered superconductors. In the resulting self-consistent potential the carriers are either delocalized or localized, which corresponds to the superconducting or insulating phase, respectively.

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Cited by in corpus (7)

• Electrodynamics of Correlated Electron Materials
• Anomalous metals: from "failed superconductor" to "failed insulator"
• Cooper pairs under the action of disorder and strong magnetic field
• Localization of disordered bosons and magnets in random fields
• Electric breakdown effect in the current-voltage characteristics of amorphous indium oxide thin films near the superconductor-insulator transition
• Two-component Coulomb Glass in Disordered Superconducting Films
• Variable range hopping theory for the nodal gap in strongly underdoped cuprate Bi${}_2$Sr${}_{2-x}$La${}_x$CuO${}_{6+\delta }$