La_(1.89)Ce_(0.11)CuO_4/La_(0.7)Ca_(0.3)MnO_3异质结的原位制备及输运性质研究  

IN SITU SYNTHESIS AND CONDUCTANCE MEASUREMENT OF La_(1.89)Ce_(0.11)CuO_4/La_(0.7)Ca_(0.3)MnO_3 HETEROSTRUCTURE

作　　者：吴昊[1] 袁洁[1] 赵力[1] 曹立新[1] 邱祥冈[1] 赵柏儒[1] 

机构地区：[1]中国科学院物理研究所凝聚态物理国家实验室,北京100080

出　　处：《低温物理学报》2005年第A01期497-502,共6页Low Temperature Physical Letters

基　　金：国家973项目(the State Key Program for Basic Research of China)支持;课题号:2004CB619004-1;国家自然科学基金(the National Natural Science Foundation)支持;课题号:10474121

摘　　要：采用脉冲激光沉积方法,在SrTi O3(STO)基片上原位制备了电子型掺杂高温超导体La1.89Ce0.11CuO4(LCCO)与超大磁电阻(CMR)材料La0.7Ca0.3MnO3(LCMO)异质结.使用X射线衍射和透射电镜分析,表明异质结是c轴取向外延生长.LCCO层的超导转变温度TC0是18.5K,LCMO层的金属-绝缘转变温度为195K.我们研究了这种异质结的界面微分电导,得到LCCO的能隙大小是4.2meV.Heterostructure of n-type superconductor La1.89Ce0.11CuO4（LCCO） and colossal magnetoresistance （CMR） material La0.7Ca0.3MnO3 （LCMO） was in situ fabricated on the SrTiO3 substrate by pulsed laser deposition. X-ray diffraction and transmission electron microscopy establish that LCCO grew epitaxially in c-axis orientation on LCMO. The critical temperature TC0 of LCCO is 18.5K and the metal-insulator transition temperature TMI of LCMO is 195K. Interracial conductance measurement was performed on this heterostructure and the superconducting energy gap of LCCO is estimated to 4.2meV.

关 键 词：电子型高温超导体 超大磁电阻材料 异质结 微分电导 

分 类 号：O511.4[理学—低温物理]