【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 .更多还原

【Abstract】 The temperature dependences of resistivity and Hall coefficient of MgB 2 and Mg 0.93 Li 0.07 B 2 were measured, and the temperature dependence of cot Θ H was calculated. The result of resistivity indicates that MgB 2 and Mg 0.93 Li 0.07 B 2 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 Mg 0.93 Li 0.07 B 2 becomes a little smaller compared with that of MgB 2 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.更多还原