Large electric field effects on the resistance of La$_{0.67}$Ca$_{0.33}$MnO$_3$ microstructures

Details Large electric field effects on the resistance of La$_{0.67}$Ca$_{0.33}$MnO$_3$ microstructures Large electric field effects on the resistance of La$_{0.67}$Ca$_{0.33}$MnO$_3$ microstructures

2011-06-02

arxiv.org/abs/1106.0382v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 5 figures

Scientific paper

We investigate electric field effects in thin film microbridges of La$_{0.7}$Ca$_{0.3}$MnO$_3$ with the focus on the regime of metal-insulator transition. A mechanically milled SrTiO$_3$ 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.

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