Critical currents and thermal activation in a-axis oriented EuBa/sub 2/Cu/sub 3/O/sub 7/ thin films

Author

Velez, M. ; Martin, J.I. ; Vicent, J.L.

Author_Institution

Dept. de Fisica de Mater., Univ. Complutense de Madrid, Spain

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

1537

Lastpage

1540

Abstract

a-axis oriented EuBa/sub 2/Cu/sub 3/O/sub 7//SrTiO/sub 3/(100) thin films have been grown by DC magnetron sputtering. Critical current and resistivity have been measured as a function of temperature, down to 15 K, and field, up to 9 T. In spite of the existence of 90/spl deg/ grain boundaries, the critical current is not limited by weak links. The lower part of the resistivity transition and the field dependence of the pinning force may be understood in terms of thermally activated flux creep with activation energy U(T,H)=U/sub 0/(T)/H and U/sub 0/ values of several hundreds of meV.<>

Keywords

Josephson effect; barium compounds; critical currents; electrical resistivity; europium compounds; flux creep; flux pinning; grain boundaries; high-temperature superconductors; sputtered coatings; superconducting thin films; superconducting transition temperature; 0 to 9 T; 15 to 300 K; DC magnetron sputtering; EuBa/sub 2/Cu/sub 3/O/sub 7/; EuBa/sub 2/Cu/sub 3/O/sub 7/ thin films; critical current; field dependence; grain boundaries; pinning force; resistivity; resistivity transitions; temperature dependence; thermally activated flux creep; weak links; Conductivity; Critical current; Current measurement; Grain boundaries; Magnetic field measurement; Magnetic flux; Sputtering; Temperature; Thermal force; Thermal resistance;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402865

Filename

402865