电流注入对La_(0.8)Te_(0.2)MnO_3/YBa_2Cu_3O_(7-δ)双层结构中YBa_2Cu_3O_(7-δ)超导电性的影响  

Effects of Current-Injection on Superconductivity of YBa_2Cu_3O_(7-δ) in La_(0.8)Te_(0.2)MnO_3/YBa_2Cu_3O_(7-δ) Bilayer

作　　者：朱亚彬[1] 周岳亮[2] 戴守愚[2] 

机构地区：[1]北京交通大学理学院物理系,北京100044 [2]中国科学院物理研究所光物理实验室中国科学院凝聚态物理中心,北京100080

出　　处：《中国稀土学报》2004年第5期719-721,共3页Journal of the Chinese Society of Rare Earths

基　　金：国家973项目(G1999064604);北京交通大学论文基金资助

摘　　要：用电泳法在厚度为5mm×10mm×0.5mm的YBa2Cu3O7-δ上沉积厚约70μm的La0.8Te0.2MnO3形成La0.8Te0.2MnO3/YBa2Cu3O7-δ(F/S)双层结构。通过扫描电子显微镜观察双层结构剖面的形貌,采用标准的四引线法测量YBa2Cu3O7-δ层的电阻特性。在F/S双层结构中通入1mA的注入电流,无论电流从S层流入F层(+Iinj),或者电流从F层流入S层(-Iinj),正常电阻均比未加注入电流时的电阻低;超导转变温度均比未加注入电流的转变温度高。La_(0.8)Te_(0.2)MnO_3/YBa_2Cu_3O_(7-δ) (F/S) bilayers were fabricated by electrophoretic technique. The thickness of La_(0.8)Te_(0.2)MnO_3 is ～70 μm, the dimensions of YBa_2Cu_3O_(7-δ) superconductor are 5 mm×10 mm×0.5 mm. The image of cross-sectional profile was measured by scanning electron microscopy (SEM). Standard four-probe method was used for YBa_2Cu_3O_(7-δ) superconducting resistance measurements. Either 1 mA current is injected from S layer to F layer (+I_(inj)) or from F layer to S layer (-I_(inj)), the normal resistance is lower than that without current injection. The critical transition temperature is higher than that without current injection.

关 键 词：金属材料 庞磁电阻 超导电性 注入电流 稀土 

分 类 号：TG14[一般工业技术—材料科学与工程] O482.51[金属学及工艺—金属材料]