Bulg. J. Phys. vol.40 no.4 (2013), pp. 337-347



Magnetic and Transport Parameters of LSMO and YBCO/LSMO Films Deposited on Sapphire Substrates

B.S. Blagoev1, T.K. Nurgaliev1, V. Štrbik2, E.S. Mateev1, A.J. Zaleski3
1Institute of Electronics, Bulg. Acad. Sci., 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
2Institute of Electrical Engineering, Slovak Academy of Sciences, 9 Dúbravská cesta str., 84104 Bratislava, Slovak Republic
3Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 2 Okólna str., 50-950 Wrocław, Poland
Abstract. La0.7Sr0.3MnO3 layers and YBa2Cu3O7-δ/La0.7Sr0.3MnO3 bilayers were grown by magnetron sputtering on sapphire substrates. The temperature dependences of the resistance of single La0.7Sr0.3MnO3 films were typical for polycrystalline manganite materials. The resistance decreases with decreasing of the temperature at medium temperatures and increases at lower and higher temperatures. Deposition of a top YBa2Cu3O7-δ layer led to a drastic increase of the sample resistance. These bilayers did not demonstrate decreasing of the resistance with decrease of the temperature. Temperature dependence of the resistance of these samples was interpreted in the framework of a phenomenological model of two intergrain conduction channels. In framework of this model, parameters of the samples were determined and discussed.

Full-text: PDF

go back