Tunneling Conductivity of Manganites with Negative Magnetoresistance
Yu.V. Medvedeva, V.Yu. Tarenkova, V.M. Svistunova, A.V. Abaloshevb, I.S. Abaloshevab and S.J. Lewandowskib
a Donetsk Physical-Technical Institute of the National Academy of Sciences of Ukraine, R. Luxemburg 72, 340114 Donetsk, Ukraine
b Instytut Fizyki PAN, Al. Lotników 32/46, 02-668 Warszawa, Poland
Full Text PDF
Tunneling investigations of ferromagnetic La0.6Sr0.4MnO3 ceramic samples showing negative magnetoresistance effect were carried out in two types of junctions: symmetric "break junctions" and asymmetric ceramics-insulator-metal junctions. The results are consistent with the presence of small ferromagnetic clusters in the insulating barriers of both types of junctions and suggest a two-phase state realized by impurity mechanism of phase separation.
DOI: 10.12693/APhysPolA.97.827
PACS numbers: 75.70.Pa