利用Mg扩散法制备出单相多晶的MgB2超导体,其超导转变的零电阻温度为38.5K左右,转变宽度小于1K.比较了不同制备工艺对样品的密度和电阻率等的影响,进行了热电势温度关系的测量.正常态电阻率温度关系均为金属型,可用函数a+bTn拟合,n～2.4.热电势研究表明其载流子为空穴型的,由其斜率估算的费米能为0.39eV.
参考文献
| [1] | J Akimitsu .in Proceedings of the Symposium on Transition Metal Oxides Sendai[J].Journal of Nagamatsu N Nakagawa,T Muranaka,Y Zenitaani,and J Akimitsu,Superconductivity at 39K in magnesium diboride,Nature,2001,410:63. |
| [2] | S L Bud′ko;G. Lapertot;C. Petrovic;C. E. Cunningham, N. Anderson, and P. C .Canfield Boron isotope effect in superconducting MgB2[J].Physical Review Letters,2001(86):1877. |
| [3] | J Bardeen;L. N. Cooper;J. R. Schrieffer .Theory of Superconductivity[J].Physical Review,1957(108):1175. |
| [4] | W L McMillan .Transition Temperature of Strong-Coupled Superconductors[J].Physical Review,1968,167:331. |
| [5] | Transition Temperature of Strong-Coupled Superconductors[J].Journal of P Carbotte Rev Mod Phys,1990(62):1027. |
| [6] | J E Hirsch .Hole superconductivity in MgB2: a high Tc cuprate without Cu Phys[J].Lett,2001,A282:392. |
| [7] | W N Kang;C.U.Jung;H.P.Kim et al.Preprint Hole carrier in MgB2 characterized by Hall Measurements[Z].cond-mat/0102313,2001. |
| [8] | C Nolscher;G. Saemann-Ischenko .Superconductivity and crystal and electronic structures in hydrogenated and disordered Nb3Ge and Nb3Sn layers with A15 structure[J].Physical Review,1985,B32:1519. |
| [9] | N P Ong.in Physical Properties of High Temperature Superconductor II[M].ed D M Ginsberg World Scientific Publishing Co,1990:459. |
| [10] | M Schneider et al.Preprint Heat and charge transport properties of MgB2[Z].cond-mat/0105429,2001. |
| [11] | R S Crisp et al.The thermopowers and resistivity of the primary solid solutions of Zinc[J].Gallium Germanium and Arsenic in copper Philos Mag,1964(10):553. |
| [12] | R D Barnard.Thermoelectricity in Metals and Alloys[M].Taylor and Francis London,1972 |
| [13] | 阎守胜.固体物理基础[M].北京:北京大学出版社,2000 |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%