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Electrical transport properties of heteroepitaxial [formula omitted]junction of charge-ordered [formula omitted]and 0.5 wt% Nb doped [formula omitted]

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
150
Identifiers
DOI: 10.1016/j.ssc.2010.07.033
Keywords
  • A. Manganites
  • B. Heterojunctions
  • C. Transport Properties
Disciplines
  • Physics

Abstract

Abstract Electrical transport properties of a heteroepitaxial p – n junction made of charge-ordered La 7/16Ca 9/16MnO 3 (LCMO) and 0.5 wt% Nb doped SrTiO 3 (SNTO) were studied. The junction displayed highly rectifying current–voltage characteristics over a temperature range from 85 to 280 K. The slope of the diffusion voltage vs temperature shows two evident changes, which can be respectively associated to the paramagnetic to ferromagnetic and ferromagnetic to antiferromagnetic (charge ordering ) magnetic transitions of LCMO. Two distinct electronic transport mechanisms are also discerned around the charge ordering temperature ( T C O ) ; thermally assisted tunneling at temperatures lower than T C O and diffusion/recombination at higher temperatures.

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