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Observation of Weak-Limit Quasiparticle Scattering via Broadband Microwave Spectroscopy of a d-Wave Superconductor

P. J. Turner·R. Harris·Saeid Kamal·M. E. Hayden·D. M. Broun·D. C. Morgan·A. Hosseini·P. Dosanjh·G. Mullins·J. S. Preston·Ruixing Liang·D. A. Bonn·W. N. Hardy
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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}.

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P. J. Turner, R. Harris, Saeid Kamal, M. E. Hayden, D. M. Broun, D. C. Morgan, A. Hosseini, P. Dosanjh, G. Mullins, J. S. Preston, Ruixing Liang, D. A. Bonn, W. N. Hardy. 2002-08-01. Observation of Weak-Limit Quasiparticle Scattering via Broadband Microwave Spectroscopy of a d-Wave Superconductor. https://doi.org/10.1103/physrevlett.90.237005

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