Low-temperature resistance and magnetoresistance hysteresis in polycrystalline (La0.5Eu0.5)0.7Pb0.3MnO3

Shaykhutdinov, K. A.; Popkov, S. I.; Semenov, S. V.; Balaev, D. A.; Dubrovskiy, A. A.; Sablina, K. A.; Sapronova, N. V.; Volkov, N. V.
March 2011
Journal of Applied Physics;Mar2011, Vol. 109 Issue 5, p053711
Academic Journal
The behavior of temperature dependences of electrical resistance and magnetoresistance of polycrystalline substituted lanthanum manganite (La0.5Eu0.5)0.7Pb0.3MnO3 at low temperatures was thoroughly studied. A broad hysteresis was found in the field dependences of electrical resistance in the low-temperature region. Above 40 K, no hysteresis feature was observed. The temperature T = 40 K corresponds to the temperature of minimum electrical resistance and the temperature TN to the antiferromagnet-paramagnet phase transition of the material of the intergrain boundaries. In this work we propose a model which explains the observed features of the ρ(T) and ρ(H) curves at temperatures below TN by the formation of a network of ferromagnet-antiferromagnet-ferromagnet tunnel contacts.


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