Microwave Electrodynamics of Electron-Doped Cuprate Superconductors
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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