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_{x^2-y^2} 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 YBa_2Cu_3O_{6.50} and YBa_2Cu_3O_{6.99}.

5 pages, 4 figures, submitted to Phys. Rev. Lett

References in corpus (5)

• Microwave Spectroscopy of Thermally Excited Quasiparticles in YBa_2Cu_3O_{6.99}
• d-Wave Model for Microwave Response of High-Tc Superconductors
• Nonlocal Effects on the Magnetic Penetration Depth in d-wave Superconductors
• Nodal Quasiparticle Lifetime in the Superconducting State of BSCCO(2212)
• Order Parameter "Holes" and Theory of Microwave Conductivity in YBCO

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