A. A. Bykov, S. I. Popkov, K. A. Shaykhutdinov, K. A. Sablina, “Relaxation of magnetoresistance of single-crystalline (La$_{0.5}$Eu$_{0.5}$)$_{0.7}$Pb$_{0.3}$MnO$_3$ in a pulsed magnetic field”, Pisma v Zhurnal Tekhnicheskoi Fiziki, 2012, Volume 38, Issue 23,Pages 89

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Relaxation of magnetoresistance of single-crystalline (La$_{0.5}$Eu$_{0.5}$)$_{0.7}$Pb$_{0.3}$MnO$_3$ in a pulsed magnetic field

A. A. Bykov, S. I. Popkov, K. A. Shaykhutdinov, K. A. Sablina

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

Abstract: The magnetoresistance (MR) of substituted lanthanum manganite (La$_{0.5}$Eu$_{0.5}$)$_{0.7}$Pb$_{0.3}$MnO$_3$ has been measured in a pulsed magnetic field with amplitude $H$ = 250 kOe at various temperatures. It is established that temperature dependence of the MR relaxation parameter $\tau(T)$ is correlated with temperature dependence of the electric resistance $R(T)$. A mechanism of relaxation is proposed that is related to the relaxation of conducting and dielectric phases in the volume of a sample under the conditions of phase separation. It is shown that the behavior of $\tau$ is related to the number of phase boundaries in the volume.

Received: 25.06.2012