Physics – Condensed Matter – Superconductivity
Scientific paper
2001-11-20
Phys. Rev. Lett., 90, 237005, 2003.
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures, submitted to Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.90.237005
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}.
Bonn Douglas A.
Broun D. M.
Dosanjh P.
Hardy Walter N.
Harris Rosemary
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