Simple real-space picture of nodeless and nodal s-wave gap functions in iron pnictide superconductors

Journal of the Physical Society of Japan

Volumn 79, Issue 3, 2010, Pages

  Kariyado, Toshikaze ^a,b   Ogata, Masao ^a,b  

^a UNIVERSITY OF TOKYO   (Japan)

^b JAPAN SCIENCE AND TECHNOLOGY AGENCY   (Japan)

Author keywords

Gap function; Iron pnictide; Multi orbital Hubbard model; Superconductivity

Indexed keywords

EID: 77949767165     PISSN: 00319015     EISSN: 13474073     Source Type: Journal    
DOI: 10.1143/JPSJ.79.033703     Document Type: Article

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25. Actually, this model gives a dispersion relation that is between LaFeAsO and NdFeAsO. Therefore, this typical-1111 model should be distinguished from the full models of LaFeAsO and NdFeAsO.
26. Here, Δ12(k) is less important than Δ11(k) and Δ22(k) in s-wave channels. (In contrast, Δ12(k) plays important roles in d-wave channels owing to the fact that Δ12(k) has s-wave symmetry when the diagonal elements of δ̂(k) have d-wave symmetry.)
27. In calculating DOS, δ̂(k)is normalized so as to have the maximal gap value of 40meV on the Fermi surface in order to avoid numerical difficulty.