Coupled-grain/RSJ series array for modeling of nonlinear microwave surface impedance of YBCO thin films

Jeffrey S. Herd, Daniel E. Oates, Hao Xin, Stuart J. Berkowitz Conductus

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The nonlinear microwave impedance of YBCO thin films may be due to Josephson-junction-like defects. In this work, high-Tc thin films are modeled as a series of ideal superconducting grains coupled by resistively shunted Josephson junctions that simulate the defects. The model calculates the surface resistance and reactance as a function of microwave current. Comparisons with experimental results from YBCO thin-film stripline resonators show good quantitative agreement for resistance at frequencies in the range 1-6 GHz and at several temperatures. Long junction effects are proposed to explain deviations between measured and computed results above 6 GHz. We have also modeled a phase-shifting device consisting of 300 high-Tc Josephson junctions in series along a microstrip transmission line. Computed results are in good quantitative agreement with the measured device phase shift versus microwave input power. Similarities in the power dependencies of the series array of junctions and the patterned film resonators will be discussed.

Original languageEnglish (US)
Pages (from-to)2117-2120
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume9
Issue number2 PART 2
DOIs
StatePublished - 1999
Externally publishedYes

Fingerprint

Josephson junctions
Microwaves
impedance
microwaves
Thin films
Resonators
thin films
resonators
microstrip transmission lines
Surface resistance
reactance
Defects
defects
Phase shift
Electric lines
phase shift
deviation
Temperature
temperature

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

Coupled-grain/RSJ series array for modeling of nonlinear microwave surface impedance of YBCO thin films. / Herd, Jeffrey S.; Oates, Daniel E.; Xin, Hao; Berkowitz Conductus, Stuart J.

In: IEEE Transactions on Applied Superconductivity, Vol. 9, No. 2 PART 2, 1999, p. 2117-2120.

Research output: Contribution to journalArticle

Herd, Jeffrey S. ; Oates, Daniel E. ; Xin, Hao ; Berkowitz Conductus, Stuart J. / Coupled-grain/RSJ series array for modeling of nonlinear microwave surface impedance of YBCO thin films. In: IEEE Transactions on Applied Superconductivity. 1999 ; Vol. 9, No. 2 PART 2. pp. 2117-2120.
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