Simultaneous Optimization of Linear and Nonlinear Microwave Response of YBCO Films

Published

June 1, 1999

Author(s)

James Booth, James A. Beall, David A. Rudman, Leila R. Vale, Ronald H. Ono, Christopher L. Holloway, S. B. Qadri, M. S. Osofsky, E. F. Skelton, J. H. Claasen, G. Gibson, J. L. MacManus-Driscoll, N. Malde, L. F. Cohen

Abstract

We present results of a systematic study of the effect of film deposition temperture on both the linear and nonlinear response of super-conducting Yba₂Cu₃O7-γ^ (YBCO) thin films and devices at microwave frequencies. Measurements of the unpatterned films show that samples grown by pulsed laser deposition at a lower substrate temperature (740 0C) display a smaller low-temperature residual surface resistance compared to films grown at a higher substrate temperature (780 0C) . However, the same films which display low residual surface resistance also show increased nonlinear effects (measured by third harmonic generation) at all temperatures. Analysis of these results suggests that the increased defects present in the films grown at the lower deposition temperature are responsible for both the lower surface resistance and the higher third harmonic generation observed in these samples. We discuss the consequences of these results for the simultaneous optimization of both linear and nonlinear microwave properties of HTS thin films and devices.

Citation

IEEE Trans. on Appl. Supercond.

Volume

9

Issue

2

Pub Type

Journals

Keywords

high-temperature superconductivity, microwave, nonlinear

Citation

Booth, J. , Beall, J. , Rudman, D. , Vale, L. , Ono, R. , Holloway, C. , Qadri, S. , Osofsky, M. , Skelton, E. , Claasen, J. , Gibson, G. , MacManus-Driscoll, J. , Malde, N. and Cohen, L. (1999), Simultaneous Optimization of Linear and Nonlinear Microwave Response of YBCO Films, IEEE Trans. on Appl. Supercond. (Accessed September 9, 2024)