Electronic Resource
Woodbury, NY
:
American Institute of Physics (AIP)
Applied Physics Letters
80 (2002), S. 1007-1009
ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We have investigated the nonlinear surface impedance and two-tone intermodulation distortion of ten epitaxial YBa2Cu3O7−δ films on MgO substrates, using stripline resonators, at frequencies f=2.3–11.2 GHz and temperatures T=1.7 K−TC. The power dissipation decreased by up to one order of magnitude as the microwave electric field was increased to 100 V/m for T〈20 K. The reactance 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 but not for YBa2Cu3O7−δ and Nb on LaAlO3 or sapphire. The anomalous response results from dielectric losses in MgO, most probably due to defect dipole relaxation. © 2002 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1447000
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