Mn位上Cu掺杂对La-Ca-Mn-O系统液氮温度磁电阻效应的影响  

INFLUENCE OF Cu DOPING IN Mn SITES OF La Ca Mn O SYSTEM ON MAGNETORESISTANCE EFFECT AT LIQUID NITROGEN

作　　者：孙霞[1] 汤萍[1] 黄真[1] 陈岳[1] 李广 陈治友[1] 刘智明 袁松柳[1] 

机构地区：[1]中国科学院合肥等离子体物理研究所

出　　处：《物理学报》1998年第6期965-969,共5页Acta Physica Sinica

摘　　要：实验研究了Ｍｎ位上Ｃｕ掺杂对Ｌａ２／３Ｃａ１／３Ｍｎ１－ｘＣｕｘＯｙ单相块材液氮温度磁电阻效应的影响．结果表明，在最佳掺杂（ｘ≈０１５）的情况下，样品表现出非常明显的磁电阻效应，且磁电阻的主要变化发生在１Ｔ以下的低磁场下；当磁场增加到６Ｔ时，该样品的磁电阻效应比高达约５×１０４％，相对于偏离最佳掺杂的样品，提高了近三个数量级．Abstract We studied the influence of Cu doping in Mn sites of single phase bulk materials La 2/3 Ca 1/3 Mn 1-x Cu x O y on their magnetoresistance effect at liquid nitrogen in experiment. We find that, for the best doped sample ( x ≈0.15), it shows great magnetoresistance effect clearly. Moreover, the main variation of the magnetoresistance is under the field below 1T. The MR ratio rises up to ～5×10 4% when the field is increased to 6T. It increases three orders of magnitude compared with samples deviated from the best doping.

关 键 词：LCMO 超导体 磁电阻效应 铜掺杂 液氮温度 

分 类 号：O511.1[理学—低温物理] TM262[理学—物理]