Superconductor-Insulator Quantum Phase Transition in BaPb1-xBixO3

Details Superconductor-Insulator Quantum Phase Transition in BaPb1-xBixO3 Superconductor-Insulator Quantum Phase Transition in BaPb1-xBixO3

2011-12-12

arxiv.org/abs/1112.2463v1

Physics

Condensed Matter

Superconductivity

Scientific paper

BaPb1-xBixO3 is found to exhibit a field-tuned superconductor to insulator quantum phase transition. For compositions close to optimal doping, the resistivity scales as Rho(T,H)=Rho_c F(|H-Hc| T^(-1/z*nu)), where Hc is a temperature-independent crossing point, and z*nu=0.69\pm0.03. This remarkable scaling, anticipated only for 2D materials but observed here for bulk 3D single crystals, can be understood in terms of a layered nanostructure, which is revealed by TEM measurements. The result establishes a key role for disorder in determining the critical temperature in BaPb1-xBixO3.

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