The growth conditions of La0.7Ca0.3MnO3(LCMO) epitaxial thin film are investigated.The results indicate that the deposition temperature plays a crucial role on the growth mode of LCMO thin film.There is an optimal deposition temperature,To,for the epitaxial growth of LCMO thin film.Just only at the To,the real epitaxial LCMO thin film can be obtained.When the deposition temperature deviates from the To,the thin film tends to be polycrystalline,although it orientes growth along a certain direction(a or c axis).Moreover,the experimental results show that just only for the epitaxial thin film the ferromagnetic-paramagnetic transition temperature(i.e.the Courier temperature Tc) equals to the metal-semiconductor transition temperature(Tp).The ferromagnetic state shows metallicity and the paramagnetic state exhibits semiconducting character.
YANG Shao-bo,ZHANG Ao(Beijing Institute of Graphic Communication,Beijing 102600,China)
