JETP Letters

, Volume 89, Issue 3, pp 156–160

Multiple bands: A key to high-temperature superconductivity in iron arsenides?

Condensed Matter


In the framework of four-band model of superconductivity in iron arsenides proposed by Barzykin and Gor’kov we analyze the gap ratios on hole—like and electron—like Fermi—surface cylinders. It is shown that experimentally observed (ARPES) gap ratios can be obtained only within rather strict limits on the values of pairing coupling constants. The difference of Tc values in 1111 and 122 systems is reasonably explained by the relative values of partial densities of states. The multiple bands electronic structure of these systems leads to a significant enhancement of effective pairing coupling constant determining Tc, so that high enough Tc values can be achieved even for the case of rather small intraband and interband pairing interactions.

PACS numbers

74.20.-z 74.20.Fg 74.20.Mn 74.20.Rp 


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  1. 1.
    M. V. Sadovskii, Usp. Fiz. Nauk 178, 1243 (2008) [Phys. Usp. 51, 1201 (2008)]; arXiv: 0812.0302.CrossRefGoogle Scholar
  2. 2.
    L. Boeri, O. V. Dolgov, and A. A. Golubov, Phys. Rev. Lett. 101, 026403 (2008); arXiv: 0803.2703v1.Google Scholar
  3. 3.
    I. I. Mazin, D. J. Singh, M. D. Johannes, and M. H. Du, Phys. Rev. Lett. 101, 057003 (2008); arXiv: 0803.2740.Google Scholar
  4. 4.
    G. Xu, W. Ming, Y. Yao, et al., Europhys. Lett. 82, 67002 (2008); arXiv: 0803.Google Scholar
  5. 5.
    I. R. Shein and A. L. Ivanovskii, Pis’ma Zh. Eksp. Teor. Fiz. 88, 115 (2008) [JETP Lett. 88, 107 (2008)]; arXiv: 0806.0750.Google Scholar
  6. 6.
    D. J. Singh, Phys. Rev. B 78, 094511 (2008); arXiv: 0807.2643.Google Scholar
  7. 7.
    I. A. Nekrasov, Z. V. Pchelkina, and M. V. Sadovskii, Pis’ma Zh. Eksp. Teor. Fiz. 87, 647 (2008) [JETP Lett. 87, 620 (2008)]; arXiv: 0804.1239.Google Scholar
  8. 8.
    I. A. Nekrasov, Z. V. Pchelkina, and M. V. Sadovskii, Pis’ma Zh. Eksp. Teor. Fiz. 88, 155 (2008) [JETP Lett. 88, 144 (2008)]; arXiv: 0806.2630.Google Scholar
  9. 9.
    I. A. Nekrasov, Z. V. Pchelkina, and M. V. Sadovskii, Pis’ma Zh. Eksp. Teor. Fiz. 88, 621 (2008) [JETP Lett. 88, 543 (2008)]; arXiv: 0807.1010.Google Scholar
  10. 10.
    V. Barzykin and L. P. Gorkov, Pis’ma Zh. Eksp. Teor. Fiz. 88, 142 (2008) [JETP Lett. 88, 131 (2008)]; arXiv: 0806.1993.Google Scholar
  11. 11.
    H. Ding, P. Richard, K. Nakayama, et al., Europhys. Lett. 83, 47001 (2008); arXiv: 0807.0419.CrossRefADSGoogle Scholar
  12. 12.
    L. Eray, D. Qian, D. Hsiech, et al., arXiv: 0808.2185.Google Scholar
  13. 13.
    D. V. Evtushinsky, D. S. Inosov, V. B. Zabolotnyy, et al., arXiv: 0809.4455.Google Scholar
  14. 14.
    R. H. Liu, T. Wu, G. Wu, et al., arXiv: 0810.2694.Google Scholar
  15. 15.
    O. V. Dolgov, I. I. Mazin, D. Parker, and A. A. Golubov, arXiv: 0810.1476.Google Scholar
  16. 16.
    L. Benfatto, M. Capone, S. Caprara, et al., Phys. Rev. B 78, 140502 (2008); arXiv: 0807.4408.Google Scholar
  17. 17.
    V. L. Gurevich, A. I. Larkin, and Yu. A. Firsov, Fiz. Tverd. Tela 4, 185 (1962) [Sov. Phys. Solid State 4, 131 (1962)].Google Scholar
  18. 18.
    M. L. Cohen, in Superconductivity, Ed. by R. D. Parks (Marcel Dekker, New York, 1969).Google Scholar
  19. 19.
    T. Sato, K. Nakayama, Y. Sekiba, et al., arXiv: 0810.3047.Google Scholar
  20. 20.
    Y. Sekiba, T. Sato, K. Nakayama, et al., arXiv: 0812.4111.Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  1. 1.Institute for EiectrophysicsUral Division RASYekaterinburgRussia

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