PdTe2纳米薄膜的电和热输运特性研究  

Electrical and Thermal Transport Properties of PdTe2 Nanofilm

作　　者：缪婷婷 向梦贤 李大炜 MIAO Ting-Ting;XIANG Meng-Xian;LI Da-Wei(Beijing Key Laboratory of Process Fluid Filtration and Separation,College of Mechanical and Transportation Engineering,China University of Petroleum-Beijing,Beijing 102249,China)

机构地区：[1]中国石油大学(北京)机械与储运工程学院,过程流体过滤与分离技术北京市重点实验室,北京102249

出　　处：《工程热物理学报》2020年第12期3041-3045,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51776224)。

摘　　要：作为第二类狄拉克半金属,PdTe2由于具有低温超导电性和特殊的能带结构,研究者们对该材料的探索集中在超导和拓扑特性,对室温下PdTe2纳米薄膜的电和热输运性质的研究尚未报道。本文采用直流通电加热法测量了厚度为136 nm的PdTe2薄膜在300 K下的电导率、热导率和磁致电阻。薄膜在室温下的电导率为3.7×10^6 S.m^-1,在迄今已研究的二维材料中是非常高的,甚至与一些传统金属铁、锌、锡和铂相当。室温下的热导率为130 W.m^-1.K^-1,远高于黄铜、青铜和铅等传统金属。薄膜的磁致电阻随磁场强度增大而增大,且正比于磁场强度的二次方,14 T时最大值为0.94%。As the second type of Dirac semimetal,PdTe2 has superconductivity and special band structure.Researchers have focused on the superconductivity and topological properties,but comprehensive research on electrical and thermal transport properties have not been reported.In this paper,the electrical conductivity,thermal conductivity and magnetoresistance of PdTe2 film with thickness of 136 nm have been measured by direct current heating method at temperature of300 K.The electrical conductivity is 3.7×10^6 S·m^-1,which is quite high among the two-dimensional materials that have been studied so far,even comparable to some traditional metals such as Fe,Zn,Sn and Pt.The thermal conductivity is 130 W-m^-1·K^-1,which is higher than that of traditional metals such as brass,bronze and lead.It is also found that the magnetoresistance increases with the strength of the magnetic field,whose maximum value is 0.94%at 14 T,which is proportional to the quadratic power of the magnetic field.

关 键 词：PdTe2纳米薄膜 电导率 热导率 磁致电阻 

分 类 号：TK124[动力工程及工程热物理—工程热物理]