Electrical and magnetic transport properties of laser-deposited Ba1 - xKxBiO3 thin films
Abstract
We report measurements of the electrical and magnetic transport properties of high-quality superconducting Ba1-xKxBiO3 (BKBO) thin films grown by in situ pulsed laser deposition. The best films exhibit sharp resistance and magnetic transitions with zero resistance above 28 K and widths of 0.3 K, and nearly linear normal state resistance extending from the transition to above room temperature. Critical current densities obtained by transport in patterned BKBO lines are greater than 3×106 A/cm2 at 4 K. The transverse magnetoresistance exhibits predominantly BCS-like behavior with an upper critical field slope of -0.78 T/K near Tc, giving Hc2(0)=15.2 T and a BCS coherence length ξ=46 Å. We also observe substantial field broadening suggestive of flux flow dissipation.
- Publication:
-
Applied Physics Letters
- Pub Date:
- July 1992
- DOI:
- Bibcode:
- 1992ApPhL..61..480S
- Keywords:
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- Bismuth Oxides;
- Mixed Oxides;
- Superconducting Films;
- Thin Films;
- Transport Properties;
- Barium Oxides;
- Critical Temperature;
- Current Density;
- Potassium Oxides;
- Solid-State Physics