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APS » Journals » Phys. Rev. B » Volume 78 » Issue 14
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Phys. Rev. B 78, 140502(R) (2008) [4 pages]

Multiple gaps and superfluid density from interband pairing in a four-band model of the iron oxypnictides

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L. Benfatto1,2, M. Capone2,3, S. Caprara2, C. Castellani2, and C. Di Castro2
1Centro Studi e Ricerche “Enrico Fermi,” via Panisperna 89/A, 00184 Rome, Italy
2CRS SMC, CNR-INFM and Dipartimento di Fisica, Università di Roma “La Sapienza,” Piazzale A. Moro 2, 00185 Rome, Italy
3ISC-CNR, Via dei Taurini 19, 00185 Rome, Italy

Received 29 July 2008; revised 3 September 2008; published 2 October 2008

We study a four-band model for the iron oxypnictides, in which the superconducting properties are assumed to be determined by the interband coupling between holelike and electronlike Fermi sheets. We show that reasonable parameters can account for the angle-resolved photoemission spectra, showing multiple gaps in Ba1−xKxFe2As2, and for the temperature dependence of the superfluid density. At the same time, the zero-temperature value of the superfluid density shows a conventional scaling with the number of carriers.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.140502
DOI:
10.1103/PhysRevB.78.140502
PACS:
74.20.Rp, 74.20.Fg, 74.25.Jb
 
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