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We present measurements of the microwave surface impedance of thesingle-layer cuprate Tl2201, deep in the overdoped regime, with Tc ~ 25 K.Measurements have been made using cavity perturbation of a dielectric resonatorat 17 discrete frequencies ranging from 2.50 to 19.16 GHz, and at temperaturesfrom 0.12 to 27.5 K. From the surface impedance we obtain the microwaveconductivity, penetration depth and superfluid density. The superfluid densitydisplays a strong linear temperature dependence from 2 to 14 K, indicative ofline nodes in the energy gap. The microwave data are compared with theoreticalpredictions for a d-wave superconductor with point-like impurities, with theconclusion that disorder in Tl2201 acts predominantly in theweak-to-intermediate-strength scattering regime, and that small-anglescattering is important.

Microwave conductivity and superfluid density in strongly overdoped Tl2201