块体金属玻璃Zr_(46.75)Ti_(8.25)Cu_(7.5)Ni_(10)Be_(2.75)的超导与负电阻温度系数  

Superconductivity and negative temperature coefficient of the resistivity of bulk metallic glass Zr_(46.75)Ti_(8.25)Cu_(7.5)Ni_(10)Be_(27.5)

作　　者：李勇[1] 闻平[2] 刘振兴[2] 景秀年[2] 王万录[1] 白海洋[2] 

机构地区：[1]重庆大学应用物理系,重庆400044 [2]中国科学院物理研究所,北京100080

出　　处：《物理学报》2004年第3期844-849,共6页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :5 0 1710 75;5 0 2 2 5 10 1和 5 0 0 3 10 10 )资助的课题~~

摘　　要：测量了块体金属玻璃Zr4 6 75Ti8 2 5Cu7 5Ni1 0 Be2 7 5在退火前后其电阻值随温度的变化 ,测量的温度范围为 1 5—30 0K .样品在退火前后都发现有超导现象 .零磁场下其超导转变温度Tc 分别为 1 84和 3 76K .在 5— 30 0K温度范围内 ,原始样品具有负的电阻温度系数 .如果取Zr,Ti,Cu ,Ni及Be分别贡献出 1 5 ,1 5 ,0 5 ,0 5及两个传导电子 ,则可以用扩展的Faber Ziman理论去解释原始样品的负电阻温度系数 .还对块体金属玻璃Zr4 6 75Ti8 2 5Cu7 5Ni1 0 Be2 7 5在温度范围 5— 30 0K之间的R(T)Electrical-resistivity measurements between 1.5 K and 300 K were performed on the Zr 46.75Ti 8.25Cu 7.5Ni 10Be 27.5 bulk metallic glasses (BMGs) before and after annealing. Results of the superconducting transition temperature measurements are presented for the BMG Zr 46.75Ti 8.25Cu 7.5Ni 10Be 27.5. The superconducting critical temperature T c is 1.84K for the as-prepared metallic glassy sample and 3.76K for the annealed sample at zero magnetic fields. The as-prepared metallic glassy sample exhibits negative temperature coefficient of the resistivity in the temperature range from 5 to 300 K. The negative temperature coefficient of the resistivity of the as-prepared metallic glassy sample can be reasonably understood with the extended Faber-Ziman theory in terms of the diffraction model for metallic glasses if it is assumed that Zr, Ti, Cu, Ni and Be contribute 1.5, 1.5, 0.5, 0.5 and 2 conduction electrons, respectively. The R(T) of the BMG Zr 46.75Ti 8.25Cu 7.5Ni 10Be 27.5 over the temperature range from 5 to 300 K was analyzed by fitting it to a polynomial using a least-squares procedure.

关 键 词：块体金属玻璃 负电阻温度系数 退火处理 超导转变温度 Faber-Ziman理论 

分 类 号：O511[理学—低温物理]