Journal
PHYSICAL REVIEW B
Volume 78, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.134523
Keywords
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Funding
- KOSEF [KRF-2007-070-C00044, KRF-2007-521-C00081]
- National Research Foundation of Korea [AA, 과06B1110] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We consider the minimal two-band model for the Fe-based superconductors with a phenomenological pairing interaction which mimics short-range antiferromagnetic fluctuations. Two superconducting (SC) gap solutions are found to exist with the model: sign-changing s-wave gap (+/- s wave) and double d-wave gap states. Both solutions hold the approximate relation Delta(max)(h)N(h)approximate to Delta(max)(e)N(e), a generic feature of two-band model with a dominant interband pairing interaction. We carried out the calculations of the SC properties of the both SC states such as the density of states, temperature dependencies of spin-lattice relaxation rate 1/T(1), Knight shift, and penetration depth, particularly taking into account of the interband coherence factors. The results are discussed in comparison with the currently available experimental data.
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