Epitaxial growth and transport properties of Bi2Sr2Co2Oy thin films by metal organic deposition

Abstract

Epitaxial Bi2Sr2Co2Oy thin films have been grown on LaAlO3 (001) by metal organic deposition. Detailed x-ray diffraction texture measurements reveal the excellent c-axis and ab-plane alignments. At 300 K, the ab-plane power factor is estimated to be more than two times larger than that of the single crystals due to the very low resistivity and the reasonably large Seebeck coefficient of the films. In addition, a large ab-plane negative magnetoresistance of 38% related to the suppression of the spin scattering is also observed in the films at low temperature.