Third-order nonlinear microwave response of YBa2Cu3O7-δ thin films and single crystals

G. Hampel, B. Batlogg, K. Krishana, N. P. Ong, W. Prusseit, H. Kinder, A. C. Anderson

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The nonlinear microwave response of superconducting YBa2Cu3O7-δ thin films and crystals was studied quantitatively by measuring the third-order harmonic amplitude A (ω: 35 GHz, jRF≤3 × 104 A/cm2). We find E to be dominated by two extrinsic effects: (1) the interaction with flux lines in weak links leading to an increased nonlinear response at low temperatures, and (2) rf related flux line creation at film edges, yielding a high E-signal close to Tc. Both effects together lead to a minimum in E around 40-60 K, which makes this temperature interval interesting for rf applications. Intrinsic nonlinearities are smaller by orders of magnitude and could not be detected.

Original languageEnglish (US)
Pages (from-to)3904-3906
Number of pages3
JournalApplied Physics Letters
Issue number26
StatePublished - Dec 29 1997

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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