Dynamic strain enhanced abnormal percolative transport and colossal electroresistance in (011)-oriented La_(0.325)Pr_(0.3)Ca_(0.375)MnO_3/0.68Pb(Mg_(1/3)Nb_(2/3)) O_3-0.32PbTiO_3 heterostructure

摘要

Abnormal percolative transport properties have been studied in (011)-oriented La_(0.325)Pr_(0.3)Ca_(0.375)MnO_3 (LPCMO)/0.68Pb(Mg_(1/3)Nb_(2/3))O_3-0.32PbTiO_3 (PMN-PT) heterostructure. By introducing a dynamic electric field-induced in-plane anisotropic strain-field in phase separated LPCMO film, we observed a significant promotion of the thermal hysteresis (～68K) and a positive colossal electroresistance (～8450%). Such abnormal hysteresis is believed to be associated with anisotropic strain induced strong pinning effect in the material. This work unambiguously evidenced the importance of the anisotropic strain on the abnormal transport and meanwhile provides alternative opportunity for well understanding the percolation mechanism in inhomogeneous systems.