title: 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 Pr(2-x)Ce(x)CuO(4-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 Nd(2-x)Ce(x)CuO(4-delta) (NCCO) crystal. We find that Deltalambda(T) has a power-law behavior for T<T(c)/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, sigma(1)(T), below T(c) and found a behavior similar to that observed in hole-doped cuprates.
authors.affiliation: Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA.
authors.initials: JD
authors.lastname: Kokales
authors.initials: P
authors.lastname: Fournier
authors.initials: LV
authors.lastname: Mercaldo
authors.initials: VV
authors.lastname: Talanov
authors.initials: RL
authors.lastname: Greene
authors.initials: SM
authors.lastname: Anlage