Field-Tuned Superconductor-Insulator Transition in BaPb1-xBixO3

Abstract

BaPb${}_{1-x}$Bi${}_x$O${}_3$ is found to exhibit a field-tuned superconductor to insulator transition for Bi compositions 0.24 $\le x\le$ 0.29. The magnetoresistance of optimally doped samples manifests a temperature-independent crossing point and scaling of the form $\rho (T,H)={\rho }_{c}F(|H-H_c|T^{-1/z\nu })$, where $H_c$ is the field determined by the temperature-independent crossing point, and $z\nu$ = 0.69 $\pm$ 0.03. High resolution transmission electron microscopy measurements reveal a complex intergrown nanostructure comprising tetragonal and orthorhombic polymorphs. Data are analyzed in terms of both a classical effective medium theory and a field-tuned quantum phase transition, neither of which provides a completely satisfactory explanation for this remarkable phenomenology.

References in corpus (3)

• The approach to a superconductor-to-Bose-insulator transition in disordered films
• Magnetic field-induced quantum superconductor-insulator transition in $N{b}_{0.15}S{i}_{0.85}$
• Electrostatic- and Parallel Magnetic Field- Tuned Two Dimensional Superconductor-Insulator Transitions

Cited by in corpus (9)

• Theory of Laser-Controlled Competing Superconducting and Charge Orders
• Stripe-like nanoscale structural phase separation and optimal inhomogeneity in superconducting BaPb${}_{1-x}$Bi${}_x$O${}_3$
• What Tc Tells
• Superconductivity-localization interplay and fluctuation magnetoresistance in epitaxial BaPb${}_{1-x}$Bi${}_x$O${}_3$ thin films
• Disorder Driven Metal-Insulator Transition in BaPb${}_{1-x}$Bi${}_x$O${}_3$ and Inference of Disorder-Free Critical Temperature
• Anomalous relaxation kinetics and charge density wave correlations in underdoped BaPb1-xBixO3
• Interface-Driven Two-Dimensional Superconductivity in Bilayers of BaBiO${}_3$ and BaPbO${}_3$
• Quantum phase transition in two-dimensional NbN superconducting thin films
• Quantum Griffiths singularity in three-dimensional MoTiN superconducting films