Spatially resolved measurements of critical parameters in superconducting filaments by laser scanning technique

Author

Abraimov, D. ; Sivakov, A.G. ; Lukashenko, A.V. ; Fistul, M.V. ; Muller, P. ; Ustinov, A.V.

Author_Institution

Phys. Inst., Erlangen-Nurnberg Univ., Germany

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

3170

Lastpage

3173

Abstract

We present an experimental study of local transport properties of superconducting filaments by means of low temperature scanning laser microscopy (LTSLM). A novel theoretical model that treats the laser-beam-induced voltage response is proposed and applied to analyze the measured data. The method of LTSLM allows to visualize the local inhomogeneities in individual filaments extracted from (Bi,Pb)₂Sr₂Ca₂Cu₃O_10+x/Ag tapes. Using the proposed theoretical analysis we extract the spatial distributions of the critical currents and critical temperatures over the sample. Tile data obtained by LTLSM show good agreement with standard non-local transport measurements. Using autocorrelation analysis of the voltage response, the characteristic length of the critical current variation is retrieved for filaments that belong to different parts of the tape

Keywords

bismuth compounds; calcium compounds; critical current density (superconductivity); high-temperature superconductors; lead compounds; multifilamentary superconductors; silver; strontium compounds; superconducting tapes; superconducting transition temperature; (Bi,Pb)₂Sr₂Ca₂Cu₃O _10+x/Ag tapes; (BiPb)₂Sr₂Ca₂Cu₃O ₁₀-Ag; autocorrelation analysis; characteristic length; critical current variation; critical parameters; high temperature superconductor; laser scanning technique; laser-beam-induced voltage response; local inhomogeneities; local transport properties; spatially resolved measurements; superconducting filaments; voltage response; Critical current; Data analysis; Data mining; Laser modes; Laser theory; Microscopy; Spatial resolution; Superconducting materials; Temperature; Voltage;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919736

Filename

919736