Current induced metastable states and abnormal electroresistance effect in epitaxial thin films of La0.8Ca0.2MnO3 |
| |
Authors: | L.P. Chen J. Gao |
| |
Affiliation: | a Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kongb Department of Physics, Zhejiang Normal University, Jinhua, Zhejiang, 321004, China |
| |
Abstract: | By applying an electric current to La0.8Ca0.2MnO3 films at 20 K, a high-resistive state is excited near the Curie point. Such a current induced metastable state turns out to be extremely sensitive to weak measuring currents. When the measuring current changes from 1 to 20 μA, the peak resistance near the metal-insulator transition temperature is reduced from 366 to , showing a remarkably enhanced electroresistance effect (ER=[R(0)−R(I)]/R(0)=70%). Also, in contrast to the previous reports, the metal-insulator transition shifts to a higher temperature. Our experiments show that the high-resistive state is metastable and cannot be removed by reversing the current direction. These behaviors yield a possibility to modulate the metal-insulator phase transition by using electric currents. |
| |
Keywords: | A. Manganite film C. Metastable states D. Electroresistance effect |
本文献已被 ScienceDirect 等数据库收录! |
|