Novel Hall-Coefficient Behavior inSuperconducting Sr₂RuO₄

Abstract

We present the temperature dependence of the Hall coefficient ( R H ) of Sr 2 RuO 4 , in which superconductivity with T c =0.93 K has been discovered recently. The value of R H shows strong temperature dependence, and sign reversal occurs at around 20 K, i.e., R H is positive and small (≤2×10 -11 m 3 C -1 ) for T >20 K, while for T <20 K R H is negative and | R H | continuously increases at least down to 1.8 K, where R H =-1.37×10 -10 m 3 C -1 . A possible mechanism of the temperature dependence of R H , involving the electron-correlation effect, is discussed.