MgB_2和Mg_(0.93)Li_(0.07)B_2的电阻率与霍尔效应研究  

STUDY ON THE RESISTIVITY AND HALL EFFECT OF MgB_2 AND Mg_(0.93) Li_(0.07) B_2

作　　者：李慧玲[1] 阮可青[1] 李世燕[1] 莫维勤[1] 樊荣[1] 罗习刚[1] 陈仙辉[1] 曹烈兆[1] 

机构地区：[1]中国科学技术大学结构分析开放实验室,物理系合肥230026

出　　处：《物理学报》2001年第10期2044-2048,共5页Acta Physica Sinica

基　　金：国家重点基础研究专项经费 (批准号 :G19990 64 6)~~

摘　　要：测量了MgB2 和Mg0 .93Li0 .0 7B2 的电阻率 ρ(T)与霍尔系数RH(T)的温度依赖关系 .电阻率的测量结果表明 ,MgB2 和Mg0 .93Li0 .0 7B2 的正常态电阻率与温度有平方的依赖关系 .MgB2 和Mg0 .93Li0 .0 7B2 的超导转变温度几乎相同 .霍尔系数的测量结果表明 ,MgB2 和Mg0 .93Li0 .0 7B2 的载流子类型为空穴型 ,二者的霍尔系数都随温度升高而减小 ,且Mg0 .93Li0 .0 7B2 的霍尔系数比MgB2 略有减小 ,这可能与Li掺杂引入空穴有关 .二者的霍尔角都与温度平方呈线性关系 .The temperature dependences of resistivity and Hall coefficient of MgB2 and Mg0.93Li0.07B2 were measured, and the temperature dependence of cot Theta (H) was calculated. The result of resistivity indicates that MgB2 and Mg0.93Li0.07B2 nearly have the same transition temperature. The possible effect on transition temperature has been discussed. The measurement of Hall coefficient suggests the type of charge carriers is hole, and the Hall coefficient of Mg0.93Li0.07B2 becomes a little smaller compared with that of MgB2 which is attributed to Li doping. Both the decrease with increasing temperature and the temperature dependence of cotangent of Hall angle are proportional to the square of temperature.

关 键 词：MGB2 Mg0.93Li0.07B2 电阻率 霍尔效应 二硼代镁 镁锂硼化物 超导体 超导转变温度 

分 类 号：O513[理学—低温物理]