Joule heating and high frequency nonlinear effects 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) , Javier Briatico (2) , Rozenn Bernard (2) , Javier Villegas (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 the surface impedance Zs = Rs + jXs of YBa2Cu3O7 thin films at 10 GHz as 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 thin film as function of microwave power is due to local heating.

Mots clés: Microwave nonlinearities; Surface impedance; High Tc superconductors

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

Julien Kermorvant, Cornelis Jacominus van Der Beek, Jean-Claude Mage, Bruno Marcilhac, Yves Lemaître, et al.. Joule heating and high frequency nonlinear effects in the surface impedance of high Tc superconductors. Journal of Applied Physics, 2009, 106, pp.023912. ⟨10.1063/1.3079520⟩. ⟨hal-00419215⟩