Nonlinear Dielectric Microwave Losses in MgO Substrates

Electrical Engineering; Germany) D. E. Oates (MIT Lincoln Laboratory; Lexington/MA; M. A. Hein (Dept. of Physics; Malvern; R. G. Humphreys (QinetiQ; UK.); U.K.) A. V. Velichko (School of Electronic; University of Birmingham; University of Wuppertal

arxiv: cond-mat/0108346 · v2 · submitted 2001-08-22 · ❄️ cond-mat.supr-con · cond-mat.mtrl-sci

Nonlinear Dielectric Microwave Losses in MgO Substrates

M. A. Hein (Dept. of Physics , University of Wuppertal , Germany) D. E. Oates (MIT Lincoln Laboratory , Lexington/MA , U.S.A.) P. J. Hirst , R. G. Humphreys (QinetiQ , Malvern , U.K.) A. V. Velichko (School of Electronic

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Electrical Engineering University of Birmingham UK.)

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classification ❄️ cond-mat.supr-con cond-mat.mtrl-sci

keywords lossesnonlineardielectricintermodulationmicrowavesubstratesanomalouscorrelated

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We have investigated the nonlinear surface impedance and two-tone intermodulation distortion of nine epitaxial YBa2Cu3O7-d films on MgO substrates, using stripline resonators, at frequencies f=2.3-11.2GHz and temperatures T=1.7K-Tc. The power dissipation decreased by up to one order of magnitude as the microwave electric field was increased to about 100V/m for T<20 K, while the reactance Xs showed only a weak increase. The minimum of the losses correlated with a plateau in the intermodulation signal. The same features were observed for a Nb film on MgO. The anomalous response is due to nonlinear dielectric losses in the substrate, which can be described by defect dipole relaxation.

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Nonlinear Dielectric Microwave Losses in MgO Substrates

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