The Effect Of Phase Separation On The Temperature Dependent Magnetoresistance In Perovskite Oxide Heterojunction

摘要

The interesting behavior of the magnetoresistance at various temperatures for the heterojunction of La_(0.9)Sr_(0.1)MnO_3/SrNb_(0.01)Ti_(0.99)O_3 is well explained based on the phase separation scenario. The good agreement between the theoretical and experimental results reveals that the mechanism for the variation in magnetoresistance with temperature and with the magnetic field is the competition between the positive magnetoresistance in the paramagnetic phase caused by the interface effect of the La_(0.9)Sr_(0.1)MnO_3/SrNb_(0.01)Ti_(0.99)O_3 p-n heterojunction and the negative magnetoresistance in the ferromagnetic phase of the La_(0.9)Sr_(0.1)MnO_3 film, respectively.