A current-density scale for characterizing nonlinearity in high-Tc superconductors

Published

June 1, 2005

Author(s)

Kenneth Leong, James C. Booth, Susan A. Schima

Abstract

In this paper, we characterize microwave nonlinearity in a high temperature superconducting (HTS) thin film sample by measurement of a geometry-independent current-density scale j_o. This quanity j specifies the strenth of a material-dependent nonlinearity, and can be used to estimate the nonlinear microwave response of planar superconducting transmission-line devices. Our procedure for measurements of j_oinvolves microwave measurements on superconducting coplanar waveguide devices patterned onto the HTS sample. In a YBa₂Cd^3^0_7-x (YBCO) sanokem we obtained a maximum experimental value in j_oof approximately 3.26x10⁸ A/cm² at 25 k. From the measured temperature-dependence of j_o in our YBCO sample, and assuming a theoretical pair-breaking current density j_c equal to 3x10⁸ A/cm^u, we calculated the temperature dependence of the quasiparticle factor b(t). The curve of the experimentally-obtained b(t) matched well with a theoretically-predicted behavior in the scenario of D-wave symmetry in the superconducting order parameters

Volume

15

Issue

2

Conference Dates

October 3-8, 2004

Conference Location

Jacksonville, FL

Conference Title

Applied Superconductivity Conference

Pub Type

Conferences

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DOI Link

Keywords

high temperature superconductors, microwave devices, nonlinear response

Citation

Leong, K. , Booth, J. and Schima, S. (2005), A current-density scale for characterizing nonlinearity in high-Tc superconductors, Applied Superconductivity Conference, Jacksonville, FL, [online], https://doi.org/10.1109/TASC.2005.849371 (Accessed October 9, 2025)