Imaging local dissipation and magnetic field in YBCO films with artificial defects

Author

Abraimov, D.V. ; Feldmann, D.M. ; Polyanskii, A.A. ; Gurevich, A. ; Liao, S. ; Daniels, G. ; Larbalestier, D.C. ; Zhuravel, A.P. ; Ustinov, A.V.

Author_Institution

Appl. Supercond. Center, Univ. of Wisconsin, Madison, WI, USA

Volume

15

Issue

2

fYear

2005

fDate

6/1/2005 12:00:00 AM

Firstpage

2954

Lastpage

2957

Abstract

We used Low Temperature Laser Scanning Microscopy (LTLSM) to investigate dc current flow in high-J_c YBCO thin films with artificially prepared defects and correlated the LTLSM response to Magneto Optical Images (MOI). Artificial defects model current blockages such as cracks, high angle grain boundaries or voids. Because the LTLSM voltage response is associated with the local electric field, while MOI shows the local perpendicular magnetic field, the combination of techniques gives complementary local information about the effect of current-limiting defects in superconductors.

Keywords

barium compounds; high-temperature superconductors; laser beam applications; magneto-optical effects; optical microscopy; superconducting thin films; yttrium compounds; LTLSM; MOI; YBCO thin films; YBaCuO; artificial defects; dc current flow; high angle grain boundaries; high-temperature superconductors; imaging local dissipation; laser applications; local electric field; local perpendicular magnetic field; low temperature laser scanning microscopy; magneto optical images; voltage response; Image motion analysis; Laser modes; Magnetic fields; Magnetic films; Magnetic force microscopy; Optical films; Optical imaging; Optical microscopy; Temperature; Yttrium barium copper oxide; High-temperature superconductors; laser applications; local electric field; local magnetic field; low temperature scanning laser microscopy; magneto optical imaging;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2005.848679

Filename

1440288