2011/06/02 by C. Beekman, Christianne Beekman, I. Komissarov +1
Materials Science · Mathematics · Physics and Astronomy · #Condensed matter physics #Dielectric #Electric field #Electron #Electronic and Structural Properties of Oxides #Field (mathematics) #Insulator (electricity) #Magnetic and transport properties of perovskites and related materials #Materials science #Mathematics #Nonlinear system #Optoelectronics #Phase (matter) #Phase transition #Physics #Physics of Superconductivity and Magnetism #Polaron #Quantum mechanics #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.85.245115
3 pages, 5 figures
arxiv created 2011/06/02 · openalex publication_date 2012/06/14 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We investigate electric-field effects in thin film microbridges of La0.67Ca0.33MnO3 with the focus on the regime of metal-insulator transition. A mechanically milled SrTiO3 substrate is used as a backgate dielectric. Inside the metal-insulator transition we find a strong unipolar field-induced reduction in resistance, as well as a suppression of the nonlinear features in the I-V curves we observed earlier. We associate the observed effects with a phase separated state in which metallic regions coexist with short range correlated polaron regions. When the glassy polaron phase has fully developed and closes off the microbridge, the field effects disappear leaving the strongly nonlinear behavior of the transport current unaltered.