Superconducting Energy Gap in BaPb1-xBixO3 Determined from Point-Contact Tunneling
Abstract
Electron tunneling measurements have been performed on single crystals of BaPb1-xBixO3 with various values of x. The observed density of states in the superconducting state can well be described by the broadened BCS density of states proposed by Dynes et al. The ratio 2\varDelta/kTc increases with increasing the Bi concentration of x, suggesting the increase of electron-phonon interactions, and saturates at around x∼0.2. The values of 2\varDelta/kTc in the saturated region coincide with the BCS value.
- Publication:
-
Journal of the Physical Society of Japan
- Pub Date:
- June 1989
- DOI:
- 10.1143/JPSJ.58.2135
- Bibcode:
- 1989JPSJ...58.2135E
- Keywords:
-
- Barium Compounds;
- Bismuth Oxides;
- Electron Phonon Interactions;
- Electron Tunneling;
- Energy Gaps (Solid State);
- High Temperature Superconductors;
- Critical Temperature;
- Lead Compounds;
- Single Crystals;
- Solid-State Physics