Josephson Effect in MgB_(2): Large I_(c)R_(N) Product and Superconducting Energy Gap  

作　　者：XUAN Yi LI Zhuang-Zhi TAO Hong-Jie REN Zhi-An CHE Guang-Can ZHAO Bai-Ru ZHAO Zhong-Xian 宣毅;李壮志;陶宏杰;任治安;车广灿;赵柏儒;赵忠贤(National Laboratory for Superconductivity,Institute of Physics and Center for Condensed Matter Physics,Chinese Academy of Sciences,Beijing 100080)

机构地区：[1]National Laboratory for Superconductivity,Institute of Physics and Center for Condensed Matter Physics,Chinese Academy of Sciences,Beijing 100080

出　　处：《Chinese Physics Letters》2001年第9期1254-1255,共2页中国物理快报（英文版）

基　　金：Supported by the State Key Program for Basic Research of China;the National Center for Research&Development on Superconductivity.

摘　　要：We report on the observation of the Josephson effect on the newly discovered superconductor MgB_(2) with the breakjunction technique. Similar to conventional superconductors, the I-V curve can be fitted with the resistively shunted junction model including the noise effect, and a large characteristic voltage V_(c)= I_(c)R_(N) = 9.6meV was obtained. The energy gap determined by the Ambegaokar-Baratoff relation with the fitted Vc is very consistent with the Bardeen-Cooper-Schrieffer weak-coupling value. Our result implies that the superconductor MgB_(2) is a promising material for Josephson device applications.

关 键 词：technique. value. JOSEPHSON 

分 类 号：O51[理学—低温物理]