Microwave Electrodynamics of Electron-Doped Cuprate Superconductors
J. David Kokales, Patrick Fournier, Lucia V. Mercaldo, Vladimir V. Talanov, Richard L. Greene, Steven M. Anlage
Abstract
We report microwave cavity perturbation measurements of the temperature dependence of the penetration depth, lambda(T), and conductivity, sigma(T) of Pr2-xCexCuO4-delta (PCCO) crystals, as well as parallel-plate resonator measurements of lambda(T) in PCCO thin films. Penetration depth measurements are also presented for a Nd2-xCexCuO4-delta (NCCO) crystal. We find that delta-lambda(T) has a power-law behavior for T<Tc/3, and conclude that the electron-doped cuprate superconductors have nodes in the superconducting gap. Furthermore, using the surface impedance, we have derived the real part of the conductivity, sigma1(T), below Tc and found a behavior similar to that observed in hole-doped cuprates.
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