Transport and Photoinduced Properties of La0.7Sr0.3MnO3 Thin Films Deposited on MgO, SrTiO3, and LaAlO3 Substrates

Abstract:

La0.7Sr0.3MnO3 (LSMO) target has been prepared by sol-gel method and the thin films of LSMO have been deposited on LaAlO3, SrTiO3, MgO substrates using the pulsed laser deposition technique. The transport and photoinduced properties of LSMO thin films on different substrates have been investigated. It is found that the phase transition temperature decreases and the electrical resistivity increases with decreasing the lattice distortion degrees for the films. The photoinduced properties show that laser induces the increase of electrical resistivity in metallic phase, and the decreases of electrical resistivity in insulating phase. The photoinduced resistivities (Δρ) of films on the MgO and SrTiO3 substrates have a maximum and a minimum due to the competition of double exchange effect and polaron effect.