Current-Induced Reversible Resistance Jumps in La_(0.8)Ca_(0.2)MnO_3 Microbridge  

作　　者：翟章印 解其云 陈贵宾 吴小山 高炬 

机构地区：[1]Department of Physics,and Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials,Huaiyin Normal University [2]Laboratory of Solid State Microstructures,and Department of Physics,Nanjing University [3]Department of Physics,The University of Hong Kong [4]Key Laboratory of Radio Frequency and MicroNano Electronics of Jiangsu Province

出　　处：《Chinese Physics Letters》2016年第5期71-74,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos U1332205,11404169 and 11274153;the Natural Science Foundation of Jiangsu Province under Grant No BK20140450;the Huaian Science and Technology(Industry)Project under Grant No HAG2014043

摘　　要：Two spatially confined La0.8Ca0.2MnO3（LCMO） microbridges with different widths, starting from a single LCMO fihn （3mm×5 mm）, are fabricated by optical lithography. A second new and robust metal-insulator transition （MIT） peak at about 75K appears, in addition to the normal MIT at 180 K observed in the standard LCMO film. When the two bridges are processed by currents of high densities, interesting reversible resistance jumps are excited only around the new peak. A stronger dependence of resistance jump on current excitation is found for the bridge with a smaller width. The temperature driven transition between new excited multiple metastable states are involved to explain the interesting low-temperature ultra-sharp jumps.Two spatially confined La0.8Ca0.2MnO3（LCMO） microbridges with different widths, starting from a single LCMO fihn （3mm×5 mm）, are fabricated by optical lithography. A second new and robust metal-insulator transition （MIT） peak at about 75K appears, in addition to the normal MIT at 180 K observed in the standard LCMO film. When the two bridges are processed by currents of high densities, interesting reversible resistance jumps are excited only around the new peak. A stronger dependence of resistance jump on current excitation is found for the bridge with a smaller width. The temperature driven transition between new excited multiple metastable states are involved to explain the interesting low-temperature ultra-sharp jumps.

关 键 词：LCMO is on of in CA 

分 类 号：O484.4[理学—固体物理]