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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.
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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 物理学报 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 物理学报 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 物理学报 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 物理学报 60 087401]
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