Large, Controllable Spikes of Magnetoresistance in La2/3Ca1/3MnO3/SrTiO3 Superlattices
AuthorFedoseev, SA; Pan, AV; Rubanov, S; Golovchanskiy, IA; Shcherbakova, OV
Source TitleACS NANO
PublisherAMER CHEMICAL SOC
University of Melbourne Author/sRubanov, Sergey
Document TypeJournal Article
CitationsFedoseev, SA; Pan, AV; Rubanov, S; Golovchanskiy, IA; Shcherbakova, OV, Large, Controllable Spikes of Magnetoresistance in La2/3Ca1/3MnO3/SrTiO3 Superlattices, ACS NANO, 2013, 7 (1), pp. 286 - 293
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C1 - Journal Articles Refereed
We have investigated superlattices consisting of up to 30 epitaxial nanomultilayers (3-7 nm thick) of ferromagnetic La(2/3)Ca(1/3)MnO(3) (LCMO) and insulating SrTiO(3) (STO) hybrids. The superlattices demonstrate dramatic shifts of Curie temperature, indicating the possibility of its tunability. The metal-insulator transition (MIT) has been observed around 140 K. Below the MIT temperature, the superlattices have shown sharp drops of resistivity, facilitating the largest and sharpest magnetoresistance peaks (>2000%) ever observed in LCMO films and superlattices at low temperatures. The observed experimental results can be explained in the frame of the phase separation model in manganites with well-organized structures. The results of magnetic and transport measurements of such hybrid structures are discussed, indicating a magnetodielectric effect in STO interlayers. The magnetic and transport properties of the superlattices are shown to be technology-dependent, experiencing dimensional transitions, which enables the creation of structures with prescribed magnetoresistance characteristics for a broad range of applications.
KeywordsSurfaces and Structural Properties of Condensed Matter; Expanding Knowledge in the Physical Sciences
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