Critical fluctuations upon photoinduced phase transition in manganite strips

查看全文 作　　者：HanXuan [1]Lin;Tian [1]Miao;Qian [1]Shi;Yang [1]Yu;Hao [1]Liu;Kai [1]Zhang;WenBin [1,2]Wang;LiFeng [1,3]Yin;Jian [1,3]Shen 机构地区：[1]State Key Laboratory of Surface Physics and Department of Physics, Fudan University;[2]Advanced Materials Laboratory, Fudan University;[3]Collaborative Innovation Center of Advanced Microstructures, Fudan University 出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2018年第61卷第9期,共5页 基　　金：supported by the National Key Research and Development Program of China(Grant No.2016YFA0300702);the National Basic Research Program of China(973 Program)(Grant No.2014CB921104);the Program of Shanghai Academic Research Leader(Grant No.17XD1400400);the National Natural Science Foundation of China(Grant No.11504053) 摘　　要：Light,acting as an external stimulus to induce various intriguing phenomena ranging from photovoltaics to photoinduced catalysis,exerts prominent effects in strongly correlated systems.It would be of particular interest to investigate photon-induced emerging phenomena in spatially confined strongly correlated systems,which are important for applications of these materials in future electronic devices.Colossal magnetoresistive manganites materials offer an ideal platform for such study due to their sensitivity to photo-excitation.Here,we fabricated 900 nm wide La_(0.325)Pr_(0.3)Ca_(0.375)Mn O_3strips,whose width is comparable to the size of the electronic phase separation(EPS)domains in this system.We observed the photoinduced critical fluctuations in the strips,where abrupt resistivity jumps occurred upon photoinduced phase transition depending sensitively on the light intensity.Based on the microscopic views of the EPS domains under photoexcitation,we conclude that such photo-induced resistivity fluctuations originate from the photoinduced phase fluctuations of individual EPS domains when their size becomes comparable to the strip width. 关 键 词：水锰矿 衣分 催化作用 系统调查 材料