Transport properties of Ag_{5}Pb_{2}O_{6}: A three-dimensional electron-gas-like system with low carrier density

Abstract

We report normal-state transport properties of the single-crystalline samples of the silver-lead oxide superconductor Ag_{5}Pb_{2}O_{6}, including the electrical resistivity, magnetoresistance, and Hall coefficient. From the Hall coefficient measurement, we confirmed that the carrier density of this oxide is as low as 5×10^{21}cm^{−3}, one order of magnitude smaller than that for ordinary alkali metals and noble metals. The magnetoresistance behavior is well characterized by the axial symmetry of the Fermi surface and by a single relaxation time. The T^2 term of the resistivity is scaled with the specific-heat coefficient, based on the recent theory for the electron-electron scattering. The present results provide evidence thatAg_{5}Pb_{2}O_{6} is a low-carrier-density three-dimensional electron-gas-like system with enhanced electron-electron scatterings.