Study of the transport properties of La0.8Ba0.2MnO3/SrTiO3:Nd heterojunctions under reverse bias

• Published in: Physica. E, Low-dimensional systems & nanostructures Low-dimensional systems & nanostructures, 2013-12, Vol.54, p.1-4
• Main Authors: Bu, H.J., Gao, J., Hu, G.J., Dai, N.
• Format: Article
• Language: English
• Subjects: Chemical solution deposition; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron states; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Electronic structure of nanoscale materials : clusters, nanoparticles, nanotubes, and nanocrystals; Exact sciences and technology; Frenkel–Poole emission; Heterojunction; Manganites; Metal-insulator transitions and other electronic transitions; Physics
• ISSN: 1386-9477; 1873-1759
• DOI: 10.1016/j.physe.2013.05.018

Heterojunctions composed of P-type La0.8Ba0.2MnO3 and N-type Nd doped SrTiO3 are successfully fabricated via chemical solution deposition. Good rectifying property is obtained. Detailed studies of the transport properties under reverse bias show that above the metal-insulator transition temperature TMI, the Frenkel–Poole emission dominates the leakage current and the emission barrier height was extracted. When placed in magnetic field, the junctions show different transport behaviors below and above TMI. It shows negative magnetoresistive effect below TMI and positive one above TMI. This is explained by the phase separation mechanism and the band structure of manganites. La0.8Ba0.2MnO3/SrTiO3:Nd heterojunctions fabricated via chemical solution method show negative and positive magnetoresistance effect below and above the metal–insulator transition temperature. [Display omitted] •LBMO/STO:Nd heterojunctions were fabricated via chemical solution deposition.•The transport property of the junction under reverse bias was studied.•The effect of magnetic field on the junctions was studied.•Frenkel–Poole emission dominates the leakage current around room temperature.•Emission barrier height was extracted from fitting.