Electron tunneling in the high-Tc bismuthate superconductors

F. Sharifi; A. Pargellis; R. C. Dynes; B. Miller; E. S. Hellman; J. Rosamilia; E. H. Hartford, Jr.

doi:10.1103/PhysRevB.44.12521

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Electron tunneling in the high-Tc bismuthate superconductors

F. Sharifi, A. Pargellis, R. C. Dynes, B. Miller, E. S. Hellman, J. Rosamilia, E. H. Hartford, Jr.

DOI 10.1103/PhysRevB.44.12521 · Physical Review B

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Abstract

We have performed extensive tunneling measurements on some high-Tc superconducting oxides of bismuth: BaPb1−xBixO3, Ba1−xRbxBiO3, and Ba1−xKxBiO3. The results on high-quality single crystals and epitaxial films indicate that these materials are weak-coupled superconductors with 2Δ/kTc=3.5±0.3. The observed quasiparticle excitation spectrum agrees with the BCS model. We also do not observe structure indicating electron-phonon coupling sufficiently strong to account for the Tc of these materials.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
BaPb1-xBixO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11	Pressure not reported	unknown
Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	23	Pressure not reported	onset