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Measurement and analysis of the in-plane electrodynamics of Y Ba2Cu3O6.993 at microwave frequencies Harris, Richard Graydon


Measurements of the electromagnetic absorption in ultra high purity YBa₂Cu₃O₆.₉₉₃ at a frequency of 75 GHz are presented. When presented in conjunction with measurements taken at 1, 2, 13 and 22 GHz from other microwave surface impedance experiments performed at UBC, the low temperature data below 20 K reveals a regime which can be characterized by an impurity limited quasiparticle scattering rate and a pure d-wave density of states. This regime is analyzed within two theoretical pictures. A simple two-fluid model with a frequency independent scattering rate can simultaneously match the magnitude of all data sets, but does not account for the observed evolution of the temperature dependence from sublinear in T at 1 GHz to super linear at 75 GHz. A generalized BCS formalism with isotropic elastic point scattering does provide the correct curvature, but in order to do so it requires a frequency dependent one body scattering rate function that cannot be derived from within the isotropic point scattering picture.

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