Magnetism

Current-voltage characteristics of polycrystalline (La$_{0.5}$Eu$_{0.5}$)$_{0.7}$Pb$_{0.3}$MnO$_3$ at low temperatures

K. A. Shaykhutdinov, D. A. Balaev, S. I. Popkov, S. V. Semenov, N. V. Sapronova, N. V. Volkov

L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk

Abstract: The current-voltage characteristics of the polycrystalline substituted lanthanum manganite (La$_{0.5}$Eu$_{0.5}$)$_{0.7}$Pb$_{0.3}$MnO$_3$ have been measured at temperatures close to the metal-insulator transition temperature and at low temperatures. In both cases, the current-voltage characteristics exhibit nonlinear properties that are strongly dependent on the strength of an applied magnetic field. The mechanisms responsible for the nonlinear properties at these temperatures are found to be different: near the metal-insulator transition, the current-voltage characteristics are determined by the phase layering inside granules, while at low temperatures, they are determined by tunneling of carriers through insulating interlayers of the granules.

Received: 21.04.2011

 English version: Physics of the Solid State, 2011, 53:12, 2455–2458

Bibliographic databases:

•