Transport properties of sol–gel derived La0.8Ba0.2MnO3/Nd:SrTiO3 heterojunctions

Heterojunctions with excellent rectifying properties are formed by growing La0.8Ba0.2MnO3 films on Nd doped SrTiO3 single crystal substrate via sol–gel method. Detailed studies show that at low temperatures tunneling effect dominates the transport process across the junction both for forward and rev...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2013-01, Vol.409, p.1-4
Main Authors: Bu, H.J., Gao, J., Hu, G.J., Dai, N.
Format: Article
Language:English
Subjects:
Bias
Condensed matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electric fields
Electric potential
Electrical junctions
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport in multilayers, nanoscale materials and structures
Exact sciences and technology
Heterojunction
Heterojunctions
Magnetic properties and materials
Magnetotransport phenomena, materials for magnetotransport
Manganite
Manganites
Metal–insulator transition
Neodymium
Physics
Sol–gel
Strontium titanates
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Summary:Heterojunctions with excellent rectifying properties are formed by growing La0.8Ba0.2MnO3 films on Nd doped SrTiO3 single crystal substrate via sol–gel method. Detailed studies show that at low temperatures tunneling effect dominates the transport process across the junction both for forward and reverse bias. While at high temperatures, thermionic emission and Frenkel–Poole emission dominate at forward and reverse bias, respectively. The most striking result here is the appearance of metal–insulator transition when the junction is reverse-biased, and the transition temperature increases by 18K when the reverse bias voltage increases from −0.9V to −2.0V. This phenomenon is explained by the strong electric field effect on the physical properties of the space charge zone.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2012.09.057