title: Observation of weak-limit quasiparticle scattering via broadband microwave spectroscopy of a d-wave superconductor.
abstract: There has long been a discrepancy between microwave conductivity measurements in high temperature superconductors and the conductivity spectrum expected in the simplest models for impurity scattering in a d-wave superconductor. Here we present a new type of broadband measurement of microwave surface resistance that finally shows some of the spectral features expected for a d(x2-y2) pairing state. Cusp-shaped conductivity spectra, consistent with weak impurity scattering of nodal quasiparticles, were obtained in the 0.6-21 GHz frequency range in highly ordered crystals of YBa2Cu3O6.50 and YBa2Cu3O6.99.
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1.
authors.forename: P J
authors.initials: PJ
authors.lastname: Turner
authors.forename: R
authors.initials: R
authors.lastname: Harris
authors.forename: Saeid
authors.initials: S
authors.lastname: Kamal
authors.forename: M E
authors.initials: ME
authors.lastname: Hayden
authors.forename: D M
authors.initials: DM
authors.lastname: Broun
authors.forename: D C
authors.initials: DC
authors.lastname: Morgan
authors.forename: A
authors.initials: A
authors.lastname: Hosseini
authors.forename: P
authors.initials: P
authors.lastname: Dosanjh
authors.forename: G K
authors.initials: GK
authors.lastname: Mullins
authors.forename: J S
authors.initials: JS
authors.lastname: Preston
authors.forename: Ruixing
authors.initials: R
authors.lastname: Liang
authors.forename: D A
authors.initials: DA
authors.lastname: Bonn
authors.forename: W N
authors.initials: WN
authors.lastname: Hardy