TITLE

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

AUTHOR(S)
Shaykhutdinov, K. A.; Popkov, S. I.; Semenov, S. V.; Balaev, D. A.; Dubrovskiy, A. A.; Sablina, K. A.; Sapronova, N. V.; Volkov, N. V.
PUB. DATE
March 2011
SOURCE
Journal of Applied Physics;Mar2011, Vol. 109 Issue 5, p053711
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
59308869

 

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