Heating and high frequency nonlinearities in the surface impedance of high Tc superconductors

Julien Kermorvant (1, 2) , Cornelis Jacominus van Der Beek (1) , Jean-Claude Mage (2) , Bruno Marcilhac (2) , Yves Lemaître (2) , Rozenn Bernard (2) , Javier Briatico (2)

1 LSI - Laboratoire des Solides Irradiés - Irradiated Solids Laboratory
2 Laboratoire Albert Fert (ex-UMPhy Unité mixte de physique CNRS/Thales)

Using the dielectric resonator method, we have investigated nonlinearities in surface impedance Zs = Rs + jXs of YBa2Cu3O7-delta thin films at 10 GHz as a function of the incident microwave power level and temperature. The use of a rutile dielectric resonator allows us to measure the precise temperature of the films. We conclusively show that the usually observed increase of the surface resistance of YBa2Cu3O7-delta thin film as function of microwave power is due to local heating.

Mots clés: Superconductivity; Superconducting thin films; Microwave dissipation; Dielectric resonator; YBa2Cu3O7 thin films

Domaines: Supraconductivité [cond-mat.supr-con]

Julien Kermorvant, Cornelis Jacominus van Der Beek, Jean-Claude Mage, Bruno Marcilhac, Yves Lemaître, et al.. Heating and high frequency nonlinearities in the surface impedance of high Tc superconductors. 25th International Conference on Low Temperature Physics LT25, Aug 2008, Amsterdam, Netherlands. ⟨10.1088/1742-6596/150/5/052107⟩. ⟨hal-00289907⟩