Transport and magnetic properties of La2/3Pb1/3MnO3 thin films

Mark Baran 2Marek Berkowski 2Jan Fink-Finowicki Stanislaw J. Lewandowski Henryk Szymczak Bozena Krzymanska 2Sergei N. Khartsev 1Yurii V. Medvedev 1Ritta Szymczak 2

1. National Academy of Sciences of Ukraine, A.Galkin Donetsk Institute for Physics & Technology (DonPTI NASU), Roza Luxemburg 72, Donetsk 83114, Ukraine
2. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland

Abstract

The magnetic and transport properties of La2/3Pb1/3MnO3 films have been studied. The films have been epitaxially grown on LaSrGaO4 substrate using dc magnetron sputtering technique. Magnetic properties of the films were measured using SQUID magnetometer. The Curie temperature was dermined being equal 211 K for the as deposited film and 176 K for the annealed film. The small persistent photoinduced changes of magnetization have been observed, especially well seen at higher temperature region. The giant magnetoresistance effect has been observed near the Curie temperature. It has been shown that strains strongly affect the properties of the films. Several mechanisms responsible for temperature dependence of films resistivity are analysed. The analysis shows that the Mott's variable-range-hopping (VRH) mechanism should be responsible in the investigated films for the conductivity above the Curie temperature.

 

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Presentation: poster at E-MRS Fall Meeting 2003, Symposium D, by Mark Baran
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-23 18:55
Revised:   2009-06-08 12:55