Effect of dc electric field on the effective microwave surface impedance of YBa2Cu3O7/SrTiO3/YBa 2Cu3O7 trilayers

A. T. Findikoglu, C. Doughty, S. M. Anlage, Qi Li, X. X. Xi, T. Venkatesan

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Abstract

We have studied the effect of a dc electric field on the effective microwave surface impedance of a thin film YBa2Cu3O 7/SrTiO3/YBa2Cu3O7 (YBCO/STO/YBCO) trilayer by a dielectric resonator technique. At large dc electric fields (≳105 V/cm), both the effective surface resistance and reactance of the sample decrease monotonically with increasing dc voltage applied to the to YBCO film, yielding at 25 K and 24.7 GHz ∥δRs/δVdc∥∼0.25 μΩ/V and ∥δXs/δVdc∥∼1.8 μΩ/V, respectively. A two-fluid analysis indicates that the changes in the surface impedance can be explained in terms of field induced changes in the superconducting carrier density of the top YBCO film.

Original languageEnglish (US)
Pages (from-to)3215-3217
Number of pages3
JournalApplied Physics Letters
Volume63
Issue number23
DOIs
StatePublished - Dec 1 1993

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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