Novel Hall-Coefficient Behavior in Superconducting Sr₂RuO₄

Abstract

We present the temperature dependence of the Hall coefficient (RH) of Sr2RuO4, in which superconductivity with Tc = 0.93 K has been discovered recently. The value of RH shows strong temperature dependence, and sign reversal occurs at around 20 K, i.e., RH is positive and small (≤2 × 10−11 m3 C−1) for T>20 K, while for T<20 K RHis negative and |RH| continuously increases at least down to 1.8 K, where RH=−1.37 × 10−10 m3 C−1. A possible mechanism of the temperature dependence of RH, involving the electron-correlation effect, is discussed. © 1995, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.