超巨磁电阻材料Pr0.67Sr0.33MnO31/f噪声缺口的发现

低温物理学报 , 2001, 23(4): 301-304. doi: 10.3969/j.issn.1000-3258.2001.04.012

超巨磁电阻材料Pr0.67Sr0.33MnO31/f噪声缺口的发现

危健 ^1, , 刘伟 ^2, , 管炜 ^3, , 熊光成 ^4, , 阎守胜 ^5,

1.北京大学物理系,

2.北京大学物理系,

3.北京大学物理系,

4.北京大学物理系,

5.北京大学物理系,

基金项目: 高等学校博士学科点专项科研项目国家自然科学基金(19934003)

OBSERVATION OF 1/f NOISE GAP IN COLOSSALMAGNETORESISTANCE MATERIAL Pr0.67Sr0.33MnO3

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Pr0.67Sr0.33MnO3 1/f噪声的大小随温度的变化.在电阻峰值温度约为160K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.

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