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Using the full-potential linearized augmented plane wave method, we studied the electronic structure and magnetic properties of SrFeAsF and Co-doped superconductor SrFe0.875Co0.125AsF. It is found that SrFeAsF exhibits a stripe antiferromagnetic ground state, and in SrFe0.875Co0.125AsF the checkboard antiferromagnetic state become a competitive candidate. The Co-doping drastically suppresses the antiferromagnetic order, increases the density of states near the Femi level and enhances the itineranly of 3d electrons. These results show that the superconductivity is induced by the magnetic fluctuations in SrFe0.875Co0.125AsF.
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Keywords:
- iron-based superconductor /
- antiferromagnetic order /
- doping /
- exchange interaction
[1] ［1］Kamihara Y, Watanabe T, Hirano M, Hosono H 2008 J. Am. Chem. Soc. 130 3296
[2] ［2］Wei Z, Li H O, Hong W L, Lü Z M, Wu H Y, Guo X F, Ruan K Q 2008 J. Supercond. Nov. Magn. 21 213
[3] ［3］Wang C, Li Y K, Zhu Z W, Jiang S, Lin X, Luo Y K, Chi S, Li L J, Ren Z, He M, Chen H, Wang Y T, Tao Q, Cao G H, Xu Z A 2009 Phys. Rev. B 79 054521
[4] ［4］Xiao Y, Su Y, Mittal R, Chatterji T, Hansen T, Kumar M N, Matsuishi S, Hosono H, Brueckel T 2009 Phys. Rev. B 79 060504
[5] ［5］Cao G H, Jiang S, Lin X, Wang C, Li Y K, Ren Z, Tao Q, Feng C M, Dai J H, Xu Z A, Zhang F C 2009 Phys. Rev. B 79 174505
[6] ［6］Tarascon J M, Greene L H, Barboux P, McKinnon W R, Hull G W, Orlando T P, Delin K A, Foner S, McNiff E J 1987 Phys. Rev. B 36 8393
[7] ［7］Sefat A S, Huq A, Mcgruire M A, Jin R, Sales B C, Mandrus D, Cranswick L M D, Stephens P W, Stone K H 2008 Phys. Rev. B 78 104505
[8] ［8］Dong J, Zhang H J, Xu G, Li Z, Li G, Hu W Z, Wu D, Chen G F, Dai X, Luo J L, Fang Z, Wang N L 2008 Europhys. Lett. 83 27006
[9] ［9］Matsuishi S, Inoue Y, Nomura T, Hirano M, Hosono H 2008 J. Phys. Soc. Jpn. 77 113709
[10] ］Tegel M, Johansson S, Weiss V, Schellenberg I, Hermes W, Pottgen R, Johrendt D 2008 Europhys. Lett. 84 67007
[11] ］Han F, Zhu X, Mu G, Cheng P, Wen H H 2008 Phys. Rev. B 78 180503
[12] ］Blaha P, Schwarz K, Sorantin P, Trickey S B 1990 Comput. Phys. Commun. 59 399
[13] ］Zhang J H, Ma R, Liu S, Liu M 2006 Acta Phys. Sin. 55 4816 (in Chinese) ［张加宏、马荣、刘甦、刘楣 2006 55 4816］
[14] ］Ma R, Zhang J H, Du J L, Liu S, Liu M 2006 Acta Phys. Sin. 55 6580 (in Chinese) ［马荣、张加宏、杜锦丽、刘甦、刘楣 2006 55 6580］
[15] ］Wu Z G, Cohen R E 2006 Phys. Rev. B 73 235116
[16] ］Drew A J, Niedermayer C, Baker P J, Pratt F L, Blundell S J, Lancaster T, Liu R H, Wu G, Chen X H, Watanabe I, Malik V K, Dubroka A, Rssle M, Kim K W, Baines C, Bernhard C 2009 Nat. Mater. 8 310
[17] ］Yao D X, Carlson E W 2008 Phys. Rev. B 78 052507
[18] ］Baker P J, Franke I, Lancaster T, Blundell S J, Kerslake L, Clarke S J 2008 Phys. Rev. B 79 060402
[19] ］Ma F J, Lu Z Y, Xiang T 2008 Phys. Rev. B 78 224517
[20] ］Si Q, Abrahams E 2008 Phys. Rev. Lett. 101 076401
[21] ］Yildirim T 2008 Phys. Rev. Lett. 101 057010
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[1] ［1］Kamihara Y, Watanabe T, Hirano M, Hosono H 2008 J. Am. Chem. Soc. 130 3296
[2] ［2］Wei Z, Li H O, Hong W L, Lü Z M, Wu H Y, Guo X F, Ruan K Q 2008 J. Supercond. Nov. Magn. 21 213
[3] ［3］Wang C, Li Y K, Zhu Z W, Jiang S, Lin X, Luo Y K, Chi S, Li L J, Ren Z, He M, Chen H, Wang Y T, Tao Q, Cao G H, Xu Z A 2009 Phys. Rev. B 79 054521
[4] ［4］Xiao Y, Su Y, Mittal R, Chatterji T, Hansen T, Kumar M N, Matsuishi S, Hosono H, Brueckel T 2009 Phys. Rev. B 79 060504
[5] ［5］Cao G H, Jiang S, Lin X, Wang C, Li Y K, Ren Z, Tao Q, Feng C M, Dai J H, Xu Z A, Zhang F C 2009 Phys. Rev. B 79 174505
[6] ［6］Tarascon J M, Greene L H, Barboux P, McKinnon W R, Hull G W, Orlando T P, Delin K A, Foner S, McNiff E J 1987 Phys. Rev. B 36 8393
[7] ［7］Sefat A S, Huq A, Mcgruire M A, Jin R, Sales B C, Mandrus D, Cranswick L M D, Stephens P W, Stone K H 2008 Phys. Rev. B 78 104505
[8] ［8］Dong J, Zhang H J, Xu G, Li Z, Li G, Hu W Z, Wu D, Chen G F, Dai X, Luo J L, Fang Z, Wang N L 2008 Europhys. Lett. 83 27006
[9] ［9］Matsuishi S, Inoue Y, Nomura T, Hirano M, Hosono H 2008 J. Phys. Soc. Jpn. 77 113709
[10] ］Tegel M, Johansson S, Weiss V, Schellenberg I, Hermes W, Pottgen R, Johrendt D 2008 Europhys. Lett. 84 67007
[11] ］Han F, Zhu X, Mu G, Cheng P, Wen H H 2008 Phys. Rev. B 78 180503
[12] ］Blaha P, Schwarz K, Sorantin P, Trickey S B 1990 Comput. Phys. Commun. 59 399
[13] ］Zhang J H, Ma R, Liu S, Liu M 2006 Acta Phys. Sin. 55 4816 (in Chinese) ［张加宏、马荣、刘甦、刘楣 2006 55 4816］
[14] ］Ma R, Zhang J H, Du J L, Liu S, Liu M 2006 Acta Phys. Sin. 55 6580 (in Chinese) ［马荣、张加宏、杜锦丽、刘甦、刘楣 2006 55 6580］
[15] ］Wu Z G, Cohen R E 2006 Phys. Rev. B 73 235116
[16] ］Drew A J, Niedermayer C, Baker P J, Pratt F L, Blundell S J, Lancaster T, Liu R H, Wu G, Chen X H, Watanabe I, Malik V K, Dubroka A, Rssle M, Kim K W, Baines C, Bernhard C 2009 Nat. Mater. 8 310
[17] ］Yao D X, Carlson E W 2008 Phys. Rev. B 78 052507
[18] ］Baker P J, Franke I, Lancaster T, Blundell S J, Kerslake L, Clarke S J 2008 Phys. Rev. B 79 060402
[19] ］Ma F J, Lu Z Y, Xiang T 2008 Phys. Rev. B 78 224517
[20] ］Si Q, Abrahams E 2008 Phys. Rev. Lett. 101 076401
[21] ］Yildirim T 2008 Phys. Rev. Lett. 101 057010
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