The surface impedance Zs = Rs +i Xs of a number of Sr2 RuO4 crystals has been measured in the frequency range f∼2-15 GHz using a dielectric resonator technique. Zs conforms to the classical skin effect only above 20 K, because the quasiparticle relaxation rate 1 τ approaches 2πf at lower temperatures. Below Tc, Rs decreases while Xs initially increases and peaks at a frequency-dependent temperature. The microwave properties are quite unlike those of conventional and high- Tc superconductors and imply a finite quasiparticle fraction at T=0 with a temperature-independent relaxation time throughout the superconducting state.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Oct 6 2006|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics