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根据两带Ginzburg-Landau 理论计算了层状超导材料NbS2的上临界磁场, 以及上临界磁场各向异性参数随温度的变化情况, 并将NbS2与MgB2, NbSe2上临界磁场的各向异性进行比较. 所得计算结果与已有实验数据符合得很好, 充分说明了NbS2的超导电性具有两能隙特征. NbS2上临界磁场各向异性参数在5.0 K附近逐渐变小, 这与MgB2和NbSe2有相似之处. 但NbS2的上临界磁场各向异性参数大约为7.3, 明显大于MgB2和NbSe2. 计算结果还表明, NbS2较大能隙所对应能带的有效质量比约为54, 另一能带的有效质量基本为各向同性.
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关键词:
- Ginzburg-Landau理论 /
- 上临界磁场 /
- NbS2
From the two-band Ginzburg-Landau theory, we study the temperature dependence of upper critical field on the layered superconductor NbS2. The temperature dependence of the anisotropic parameter for upper critical filed is also obtained. All the results fit the experimental data well in a broad temperature range. Thus our results show strong evidence that two-gap scenario is better to account for the superconductivity of NbS2. The anisotropic parameter of the upper critical field for NbS2 starts to decrease from 5.0 K, and this behavior is similar to those of MgB2 and NbSe2. However for NbS2 this number is about 7.3, which is much greater than the ones in MgB2 and NbSe2. The results also show that the band with the larger gap exhibits that the effective mass ratio between the in-plane and out-of-plane direction is about 54, and the other band indicates that the effective mass ratio is almost isotropic.-
Keywords:
- Ginzburg-Landau theory /
- upper critical field /
- NbS2
[1] Nagamatsu J, Nakagawa N, Muranaka T, Zenitani Y, Akimitsu J 2001 Nature 63 410
[2] Kortus J, Mazin I I, Be1ashchenko K D, Antropov V P, Boyer L L 2010 Phys. Rev. Lett. 86 4656
[3] Liu A Y, Mazin L Y, Kortus J 2001 Phys. Rev. Lett. 87 087005
[4] Bouquet F, Fisher R A, Phillips N E 2001 Phys. Rev. Lett. 87 047001
[5] Chen X K, Konstantinovich M J, Irwin J C 2001 Phys. Rev. Lett. 87 157002
[6] Matthias B T, Geballe T H, Compton V B 1963 Rev. Mod. Phys. 35 1
[7] Yokoya T, Kiss T, Chainani A, Shin S, Nohara M, Takagi H 2001 Science 294 2518
[8] Fletcher J D, Carrington A, Diener P, Rodiere P, Brison J P, Prozorov R, Olheiser T, Giannetta R W 2007 Phys. Rev. Lett. 98 057003
[9] Huang C L, Lin J Y, Chang Y T, Sun C P, Shen H Y, Chou C C, Berger H, Lee T K, Yang H D 2007 Phys. Rev. B 76 212504
[10] Hambourger P D, DiSalvo F J 1980 Physica B 99 173
[11] Thompson A H, Gamble F R, Koehler R F 1972 Phys. Rev. B 5 2811
[12] DiSalvo F J, Bagley B G, Voorhoeve J M, Waszczak J V 1973 J. Phys. Chem. Solids 34 1357
[13] Edwards J, Frindt R F 1971 J. Phys. Chem. Solids 32 2217
[14] Prober D E, Schwall R E, Beasley M R 1980 Phys. Rev. B 21 2717
[15] Pfalzgraf B W, Spreckels H 1987 J. Phys. C 27 4359
[16] Moncton D E, Axe J D, DiSalvo F J 1975 Phys. Rev. Lett. 34 734
[17] Guillamon I, Suderow H, Vieira S, Cario L, Diener P, Rodiere P 2008 Phys. Rev. Lett. 101 166407
[18] Kacmarc J, Pribulova Z, Marcenat C, Klein T, Rodiere P, Cario L, Samuely P 2010 Phys. Rev. B 82 014518
[19] Zhitomirsky M E, Dao V H 2004 Phys. Rev. B 69 054508
[20] Askerzade I N, Gencer A, Guclu N 2002 Supercond. Sci. Technol. 15 13
[21] Doh H, Sigrist M, Cho B K, Lee S 1999 Phys. Rev. Lett. 83 5350
[22] Tinkham M 1996 Introduction to Superconductivity (2nd Ed.) (New York: McGraw-Hill) p134
[23] Yang D S, Wu B M, Li B, Zheng W H, Li S Y, Fan R, Chen X H, Cao L Z 2003 Acta Phys. Sin. 52 683 (in Chinese) [杨东升, 吴柏枚, 李波, 郑卫华, 李世燕, 樊荣, 陈仙辉, 曹烈兆 2003 52 683]
[24] Sun X, Huang X, Wang Y Z, Feng Q R 2011 Acta Phys. Sin. 60 087401 (in Chinese) [孙玄, 黄煦, 王亚洲, 冯庆荣 2011 60 087401]
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[1] Nagamatsu J, Nakagawa N, Muranaka T, Zenitani Y, Akimitsu J 2001 Nature 63 410
[2] Kortus J, Mazin I I, Be1ashchenko K D, Antropov V P, Boyer L L 2010 Phys. Rev. Lett. 86 4656
[3] Liu A Y, Mazin L Y, Kortus J 2001 Phys. Rev. Lett. 87 087005
[4] Bouquet F, Fisher R A, Phillips N E 2001 Phys. Rev. Lett. 87 047001
[5] Chen X K, Konstantinovich M J, Irwin J C 2001 Phys. Rev. Lett. 87 157002
[6] Matthias B T, Geballe T H, Compton V B 1963 Rev. Mod. Phys. 35 1
[7] Yokoya T, Kiss T, Chainani A, Shin S, Nohara M, Takagi H 2001 Science 294 2518
[8] Fletcher J D, Carrington A, Diener P, Rodiere P, Brison J P, Prozorov R, Olheiser T, Giannetta R W 2007 Phys. Rev. Lett. 98 057003
[9] Huang C L, Lin J Y, Chang Y T, Sun C P, Shen H Y, Chou C C, Berger H, Lee T K, Yang H D 2007 Phys. Rev. B 76 212504
[10] Hambourger P D, DiSalvo F J 1980 Physica B 99 173
[11] Thompson A H, Gamble F R, Koehler R F 1972 Phys. Rev. B 5 2811
[12] DiSalvo F J, Bagley B G, Voorhoeve J M, Waszczak J V 1973 J. Phys. Chem. Solids 34 1357
[13] Edwards J, Frindt R F 1971 J. Phys. Chem. Solids 32 2217
[14] Prober D E, Schwall R E, Beasley M R 1980 Phys. Rev. B 21 2717
[15] Pfalzgraf B W, Spreckels H 1987 J. Phys. C 27 4359
[16] Moncton D E, Axe J D, DiSalvo F J 1975 Phys. Rev. Lett. 34 734
[17] Guillamon I, Suderow H, Vieira S, Cario L, Diener P, Rodiere P 2008 Phys. Rev. Lett. 101 166407
[18] Kacmarc J, Pribulova Z, Marcenat C, Klein T, Rodiere P, Cario L, Samuely P 2010 Phys. Rev. B 82 014518
[19] Zhitomirsky M E, Dao V H 2004 Phys. Rev. B 69 054508
[20] Askerzade I N, Gencer A, Guclu N 2002 Supercond. Sci. Technol. 15 13
[21] Doh H, Sigrist M, Cho B K, Lee S 1999 Phys. Rev. Lett. 83 5350
[22] Tinkham M 1996 Introduction to Superconductivity (2nd Ed.) (New York: McGraw-Hill) p134
[23] Yang D S, Wu B M, Li B, Zheng W H, Li S Y, Fan R, Chen X H, Cao L Z 2003 Acta Phys. Sin. 52 683 (in Chinese) [杨东升, 吴柏枚, 李波, 郑卫华, 李世燕, 樊荣, 陈仙辉, 曹烈兆 2003 52 683]
[24] Sun X, Huang X, Wang Y Z, Feng Q R 2011 Acta Phys. Sin. 60 087401 (in Chinese) [孙玄, 黄煦, 王亚洲, 冯庆荣 2011 60 087401]
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