Cu doping effect on Mn sites of La_(2/3)Ca_(1/3) MnO_3 system  

作　　者：SUN Xia, TANG Ping, CHEN Yue, HUANG Zhen, LI Guang,LIU Zhimin, CHEN Zhiyou, WANG Sheng and YUAN Songliu High Magnetic Field Laboratory, Institute of Plasma Physics, Chinese Academy of Sciences, P. O. Box 1126, Hefei 230031, China 

出　　处：《Chinese Science Bulletin》1998年第17期1442-1447,共6页

摘　　要：The temperature dependence of resistance and magnetoresistance at 77 K for Cu-doped La 2/3Ca 1/3Mn 1-xCu xO-3 have been investigated. Besides the transition similar to the Cu-free sample at ～260 K, a new transition at lower temperature appears for Cu-doped samples. The new transition moves toward low temperature with increasing of Cu content. A new conductive proceeding related to Cu ion may exist. Magnetoresistance at liquid nitrogen shows that MR increased three orders when x is changed from 0 to 0 15. Moreover, the main variation of magnetoresistance is below the field of 1 T.The temperature dependence of resistance and magnetoresistance at 77 K for Cu-doped La 2/3Ca 1/3Mn 1-xCu xO-3 have been investigated. Besides the transition similar to the Cu-free sample at ～260 K, a new transition at lower temperature appears for Cu-doped samples. The new transition moves toward low temperature with increasing of Cu content. A new conductive proceeding related to Cu ion may exist. Magnetoresistance at liquid nitrogen shows that MR increased three orders when x is changed from 0 to 0 15. Moreover, the main variation of magnetoresistance is below the field of 1 T.

关 键 词：Colossal MAGNETORESISTANCE Cu DOPING TRANSFER behavior CHARGE transfer. 

分 类 号：O511[理学—低温物理]