Anomalies of resistivity and its T³ -dependence at low temperatures in Eu-based valence fluctuating systems

Abstract

Ce-based valence fluctuating systems, in general, are known to exhibit anomalous temperature dependence of resistivity, ϱ(T). In contrast, resistivity measurements have been reported thus far on only two Eu-based valence fluctuating (VF) systems and therefore further investigations are required on such materials. Here we report the results of our measurements of the temperature dependence of the resistance R(T) of three Eu-based VF-systems, viz., EuIr₂Si₂, Eu₂Ni₃Si₅ and EuNiSi₂. The measurements of R(T) have also been carried out in Eu₂Au₃Si₅ and EuNi₂Si₂, where Eu is divalent and trivalent respectively. These studies reveal an anomalous behaviour of R(T) in the above-mentioned Eu-based VF-systems.