Pauli-limited critical field of Ba/sub 1-x/K/sub x/BiO/sub 3/ determined from quasiparticle tunneling

Author

Roesler, G. ; Tedrow, P.M. ; Hellman, E.S. ; Hartford, E.H.

Author_Institution

Francis Bitter Nat. Magnet Lab., MIT, Cambridge, MA, USA

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

1280

Lastpage

1282

Abstract

A planar tunnel diode with Ba/sub 1-x/K/sub x/BiO/sub 3/ (BKBO) and Ag electrodes were fabricated. The dynamic conductance of the junction was similar to that found with conventional BCS superconductors. Using weak coupling theory, the undepaired transition temperature, spin-orbit scattering rate, and diffusion constant of BKBO were determined. The Pauli-limited critical field was calculated and compared to the measured resistive transitions of the BKBO film in magnetic fields. The Pauli-limited field is observed to occur generally at the field where the normal-state resistance is restored.<>

Keywords

barium compounds; high-temperature superconductors; potassium compounds; silver; spin-orbit interactions; superconducting critical field; superconducting junction devices; superconducting transition temperature; superconductive tunnelling; Ba/sub 1-x/K/sub x/BiO/sub 3/-Ag; Pauli-limited critical field; diffusion constant; dynamic conductance; high temperature superconductors; planar tunnel diode; resistive transitions; spin-orbit scattering rate; weak coupling theory; Diodes; Electrical resistance measurement; Electrodes; Immune system; Magnetic field measurement; Magnetic films; Scattering; Superconducting films; Superconducting transition temperature; Superconductivity;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233390

Filename

233390