The microwave surface impedance of ultra-pure superconducting metals

Matthias Hein, Rodrigo Ormeno, Colin Gough

Research output: Contribution to journalLetter

5 Citations (Scopus)


Quasiparticle relaxation and non-local effects on the surface impedance Z(s) of pure metals are analysed for arbitrary relaxation times tau and mean free paths I. The analysis predicts a non-monotonic variation of the differential loss tangent (partial derivativeR(s)/partial derivative tau)/(partial derivativeX(s)/partial derivative tau) in the normal state, which distinguishes it from the classical limits. In the superconducting state, Z(s) can be described by a two-fluid model incorporating a Drude-type conductivity and an effective relaxation time tau (e). The t-values derived from theory and data measured on Sr2RuO3-crystals using a hollow dielectric resonator technique at 10 GHz are consistent, and in accordance with DC resistivity data.
Original languageEnglish
Pages (from-to)L65-L71
JournalJournal of Physics: Condensed Matter
Issue number4
Early online date11 Jan 2001
Publication statusPublished - 29 Jan 2001


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