We have measured DC current-voltage characteristics of undoped semiinsulating BaTiO3 single crystals and found that the dc conductance defined by the measurements peaks at all three ferroelectric phase transitions of BaTiO3. The peaks are evident in crystals that possess a low coercive field EC and have, in most cases, the spontaneous polarization component perpendicular to the surface. The conductance of the crystals is typically 1 nΩ-1cm-1 at the peak of the paraelectric-ferroelectric transition and exhibits a temperature dependence different from the thermal-activation type. The present study proves that the observed peaking represents a real carrier-conduction anomaly. This anomaly can be a manifestation of a new liquid-like state of electron polarization at phase transitions.
|Number of pages||4|
|Journal||Journal of the Korean Physical Society|
|Publication status||Published - Jan 1 2005|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)