Abnormal magnetoresistance behavior in Nb thin films with rectangular arrays of antidots  

作　　者：张伟君 何世坤 李博宏 程飞 许兵 温振超 曹文会 肖宏 韩秀峰 赵士平 邱祥冈 

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

出　　处：《Chinese Physics B》2012年第7期487-490,共4页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China (Grant Nos. 2009CB929100, 2011CBA00107, and 2012CB921302);the National Science Foundation of China (Grant Nos. 10974241 and 11104335)

摘　　要：Magnetoresistance in superconducting Nb films perforated with rectangular arrays of antidots （holes） is investigated at various temperatures and currents. Normally, the magnetoresistance increases with the increasing magnetic field. In this paper, we report a reverse behavior in a certain range of high fields after vortex reconfiguration transition, where the resistances at non-matching fields are smaller than those in the low field regime. This phenomenon is due to a strong caging effect, in which the interstitial vortices are trapped among the pinned multiquanta vortices. This effect is temperature and current dependent.Magnetoresistance in superconducting Nb films perforated with rectangular arrays of antidots （holes） is investigated at various temperatures and currents. Normally, the magnetoresistance increases with the increasing magnetic field. In this paper, we report a reverse behavior in a certain range of high fields after vortex reconfiguration transition, where the resistances at non-matching fields are smaller than those in the low field regime. This phenomenon is due to a strong caging effect, in which the interstitial vortices are trapped among the pinned multiquanta vortices. This effect is temperature and current dependent.

关 键 词：MAGNETORESISTANCE caging effect rectangular arrays of antidots 

分 类 号：O484.4[理学—固体物理]