Interface behavior in La1−xSrxFeO3−δ /Nb:SrTiO3 perovskite
oxide heterostructures CAROLINE (LIGE) ZHANG, MARK SCAFETTA,
STEVEN MAY, Drexel University — We report the interfacial transport behavior
in La1−xSrxFeO3−δ /Nb:SrTiO3 perovskite oxide heterostructures. Strained epitaxial
films were deposited on SrTiO3 and Nb:SrTiO3 substrates using oxide molecular
beam epitaxy. Oxygen concentration was controlled by heating and re-annealing
in a tube furnace with a mixture of O2 and O3. Temperature dependent currentvoltage
(I-V) characteristics were measured from the junctions. From these I-V
data, ideality factors for the heterojunctions were obtained. The ideality factors are
found to be much larger than 1, indicating transport differs substantially compared
to conventional semiconductor heterostructures.
