Low field, room temperature magnetoresistance in (Lay-xMx)(y)MnO3-delta (M= Ca, Sr) thin-films deposited by liquid delivery CVD

Liquid delivery, metal-organic chemical vapor deposition (MOCVD) was used t o deposit high quality, A-site deficient crystalline films of (Lay-xMx)(y)M nO3-delta (where M = Ca, Sr and y < 1). The properties of the deposited thi n-films are strongly dependent upon the film stoichiometry and display magn etoresistive responses at or above room temperature. Using Ca and Sr doped A-site deficient thin-films, we can shift the metal to insulator transition (Tc) in a controlled manner to temperatures that are useful for commercial applications. Further, these films exhibit useful magnetoresistance at roo m temperature in relatively small applied magnetic fields. (C) 1998 Elsevie r Science S.A. All rights reserved.