K. A. Shaykhutdinov, S. V. Semenov, D. A. Balaev, M. I. Petrov, N. V. Volkov, “Hysteresis of magnetoresistance in granular La$_{0.7}$Ca$_{0.3}$MnO$_3$ at low temperatures”, Fizika Tverdogo Tela, 2009, Volume 51, Issue 4,Pages 734

This article is cited in 9 papers

Magnetism and ferroelectricity

Hysteresis of magnetoresistance in granular La$_{0.7}$Ca$_{0.3}$MnO$_3$ at low temperatures

K. A. Shaykhutdinov^a, S. V. Semenov^ab, D. A. Balaev^a, M. I. Petrov^a, N. V. Volkov^ab

^a L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
^b Siberian Federal University, Krasnoyarsk

Abstract: The magnetoresistance of granular La$_{0.7}$Ca$_{0.3}$MnO$_3$ is studied experimentally over wide ranges of temperatures and magnetic fields. The emphasis is on anomalously large hysteresis of magnetoresistance at low temperatures ($T$ = 4.2 K). The observed $\rho(H)$ dependence can be qualitatively explained by spin-dependent tunneling of electrons through the dielectric boundaries of conducting granules characterized by a wide spread in the magnetic-moment magnitudes.

Received: 09.07.2008
Accepted: 03.09.2008