组分调制Cu_3 NPd_x的大温区恒定电阻率  

Composition-modulated Cu_3 NPd_x for invariant resistivity over a wide temperature range

作　　者：纪爱玲[1] 杜允[1] 黄娆[1] 李超荣[1] 曹则贤[1] 

机构地区：[1]中国科学院物理研究所北京凝聚态物理国家实验室,北京100080

出　　处：《物理》2006年第11期924-926,共3页Physics

基　　金：国家自然科学基金(批准号:60306009;50472070;10404034;10574147)资助项目

摘　　要：单一固体材料的电阻率是关于温度的复杂函数.目前尚未见关于相当大的温度范围内恒定电阻率的报道;对恒电阻的需求仍然是通过材料结构组合或电路设计实现的.Cu3NPdx随组份的变化会经历半导体-半金属相变,在Cu3NPd0.238中可以在240K的温度范围内测得不变的电阻率.这一发现至少表明大温区内恒电阻是可以在单一材料内实现的,它对固体物理的理解本身以及诸多应用都有重要的意义.Electrical resistivity for individual solids is generally a complicated function of temperature. There has been no report on a constant electrical resistivity in a sizalle temperature range observed in any single solid, and the constant resistance demanded for many applications has been realized only through structure designs or circuits. In the composition-modulated Cu3 NPdx which undergoes semiconducting-to-semimetallic transition, a nearly vanishing temperature coefficient of resistance was measured in a temperature range over 240 K in Cu3NPd0.238. This, to the least, demonstrates the possibility of constant resistivity in a single solid, thus is of significance for both the understanding of solid-state physics and applications.

关 键 词：温阻系数 Cu3NPdx 半导体-半金属相变 组份调制 

分 类 号：O482.4[理学—固体物理]