Abstract

La 0.8Ca 0.2MnO 3 epitaxial thin films were fabricated on SrTiO 3 (100) substrates by using pulsed-laser deposition (PLD) technique. The transport behavior upon treatments by applying a large dc current has been investigated. It is found that when the applied dc current exceeds a threshold value the electric resistivity in these films could be significantly enhanced in the whole measured temperature range from 10 to 300 K. Simultaneously, abnormal electroresistance behavior appears. The enhanced resistance turns out to be sensitive to a weak current. Even a very small dc current could remarkably depress the high resistance, showing an unusual colossal ER effect. ER reaches ∼1175% at temperatures lower than ∼50 K, and ∼705% at 300 K for a current changing from 0.7 to 11 μA. Structure measurements on micro-area by micron-XRD technique were carried out. No change of the structure and lattice parameter was found upon current treatments.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.