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We measured electrical resistivity, specific heat and magnetic susceptibilityof single crystals of highly conductive oxide Ag_5Pb_2O_6, which has a layeredstructure containing a Kagome lattice. Both the out-of-plane and in-planeresistivity show T^2 dependence in an unusually wide range of temperatures upto room temperature. This behavior cannot be accounted for either by electroncorrelation or by electron-phonon scattering with high frequency optic phonons.In addition, a phase transition with a large diamagnetic signal was found inthe ac susceptibility, which strongly suggests the existence of asuperconducting phase below 48 mK.Comment: 5 pages, 5 figures; accepted for publication in Physcal Review B;  Revised version: small correction in the caption of Fig.

Nonlinear temperature dependence of resistivity in single crystal Ag5Pb2O6