Field-tuned superconductor-insulator transition in BaPb1-xBixO3

TitleField-tuned superconductor-insulator transition in BaPb1-xBixO3
Publication TypeJournal Article
Year of Publication2012
AuthorsGiraldo-Gallo P, Lee H, Zhang Y, Kramer MJ, Beasley MR, Geballe TH, Fisher IR
Journal TitlePhysical Review B
Volume85
Pages174503
Date Published05
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000310333800002
Keywordsba1-xkxbio3, metal-semiconductor transition, phase-transitions, system bapb1-xbixo3, temperature, thin-films
Abstract

BaPb1-xBixO3 is found to exhibit a field-tuned superconductor to insulator transition for Bi compositions 0.24 <= x <= 0.29. The magnetoresistance of optimally doped samples manifests a temperature-independent crossing point and scaling of the form rho(T,H) = rho F-c(vertical bar H - H-c vertical bar T-1/zv), where H-c is the field determined by the temperature-independent crossing point, and zv = 0.69 +/- 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.

URL<Go to ISI>://WOS:000310333800002
DOI10.1103/PhysRevB.85.174503
Alternate JournalPhys. Rev. B