Electron hopping in Eu1–xSrxFeO3 and Nd1–xSrxCoO3

Abstract

Mössbauer and electrical resistivity measurements on Eu_1–xSr_xFeO₃(0.0 < x⩽ 0.4) show the presence of a time-averaged electron configuration of Fe in these solids at T > T_N. Variable range hopping arising from Anderson localization seems to occur at T < T_N indicating that the electron hopping time in this regime is likely to be greater than 10^–7 s. Mössbauer studies on Nd_1–xSr_xCoO₃ show that in the Anderson localization regime, the hopping time is greater than 10^–7 s in this system as well.