超巨磁电阻材料Pr_(0.67)Sr_(0.33)MnO_31/f噪声缺口的发现  

OBSERVATION OF 1/f NOISE GAP IN COLOSSALMAGNETORESISTANCE MATERIAL Pr_(0.67)Sr_(0.33)MnO_3

作　　者：危健[1] 刘伟[1] 管炜[1] 熊光成[1] 阎守胜[1] 

机构地区：[1]北京大学物理系,北京100871

出　　处：《低温物理学报》2001年第4期301-304,共4页Low Temperature Physical Letters

基　　金：自然科学基金 (No .19934 0 0 3);教育部博士点基金资助项目

摘　　要：采用锁相放大器从液氮温度到室温实时记录超巨磁电阻材料Pr0 .67Sr0 .3 3 MnO3 1/f噪声的大小随温度的变化 .在电阻峰值温度约为 16 0K的样品上 ,在略低于峰值温度处观测到温度宽度约为 5K的 1/f噪声缺口 ,文中并对这一现象的物理原因 ,作了初步的分析 .Using lock-in amplifier the real time fluctuations of 1/ f noise in colossal magnetoresistance material Pr 0.67Sr 0.33MnO 3 was recorded continuously from liquid nitrogen temperature to room temperature. For the sample with resistance peak at about 160K, a 1/ f noise gap about 5K in width was observed at the temperature a little lower than peak temperature of resistivity. Some primary analysis are provided according to theories of colossal magnetoresistance material.

关 键 词：超巨磁电阻材料 Pr0.67Sr0.33MnO3 1/f噪声 缺口分析 CMR 超巨磁电阻效应 凝聚态物理 

分 类 号：O513[理学—低温物理]