Abstract
La0.85Sr0.15MnO3 (LSMO)/TiO2 heterostructures were synthesized by RF magnetron sputtering with different LSMO thicknesses. Rectifying properties of the junctions are related to the LSMO thickness and good rectifying properties appear in a LSMO (100 nm)/TiO2 junction. Furthermore, the excellent rectifying characteristic is presented in a relatively wide temperature range for LSMO (100 nm)/TiO2 heterostructures. All samples exhibit a huge effective resistance which plays an important role in the current–voltage curves as well as the rectifying properties. The diffusion potential of the heterostructures decreases with increasing measurement temperature, which is attributed to the modulation of the interface electronic structure of LSMO/TiO2 heterostructures. It is worth noting that the metal–insulator (M–I) transition of LSMO also appears in the heterostructures and the increased sheet resistance of heterostructures at low temperature is related to the introduction of TiO2.
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