Intrinsic nonlinearity probed by intermodulation distortion microwave measurements on high quality MgB2 thin films

Abstract

The two tone intermodulation distortion arising in MgB2 thin films synthesized by hybrid physical-chemical vapour deposition is studied in order to probe the influence of the two bands on the nonlinear response of this superconductor. The measurements are carried out by using a dielectrically loaded copper cavity operating at 7 GHz. Microwave data on samples having critical temperatures above 41 K, very low resistivity values, and residual resistivity ratio larger than 10, are shown. The dependence of the nonlinear surface losses and of the third order intermodulation products on the power feeding the cavity and on the temperature is analyzed. At low power, the signal arising from distortion versus temperature shows the intrinsic s-wave behavior expected for this compound. Data are compared with measurements performed on Nb and YBCO thin films using the same technique.

Revised version. Submitted to APL on October 7th 2005

References in corpus (7)

• In situ epitaxial MgB2 thin films for superconducting electronics
• Nonlinear Meissner Effect in CuO Superconductors
• Thermodynamics of the Mg-B system: Implications for the deposition of MgB2 thin films
• The Nonlinear Meissner Effect in Unconventional Superconductors
• Nonlinear microwave response of MgB2
• Microwave intermodulation distortion of MgB2 thin films
• Nonlinear current response of one- and two-band superconductors

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