Low-temperature resistivity of silver

Abstract

The resistivity rho has been measured between 0.04 and 7K for 'pure' polycrystalline ingots of silver, in a dilution refrigerator with a SQUID null detector system. The measurements confirm the existence of a substantial temperature range where rho - rho 0 varies as T4. At the lowest temperatures rho - rho 0 varies as T2.19, which strongly suggests that an electron-electron scattering T2 regime may be reached using a higher-precision measuring technique.