Origin of gap anisotropy in spin fluctuation models of the iron pnictides

Physical Review B - Condensed Matter and Materials Physics

Volumn 79, Issue 22, 2009, Pages

  Maier, T A ^a   Graser, S ^b   Scalapino, D J ^c   Hirschfeld, P J ^d  

^a OAK RIDGE NATIONAL LABORATORY   (United States)

^b UNIVERSITY OF AUGSBURG   (Germany)

^c UNIVERSITY OF CALIFORNIA   (United States)

^d University of Florida ^*  (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 67650081169     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.79.224510     Document Type: Article

References (25)

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20. Here we have set the on-site intraorbital U=5/3, the exchange J=2 J′ =U/8, and the interorbital V=U-3/4J- J′. These represent typical parameters for which the leading pairing strength occurs in the singlet A1g state. We find similar behavior for a range of parameters.
21. We have also examined a parameter range in which a d x2 - y2 B1g gap is favored. Here, the anisotropy occurs on the α1 and α2 Fermi surfaces where the gap has d x2 - y2 symmetry. This is dominantly driven by the α-β scattering processes and arises naturally from the sign change in the gap on the β1 Fermi surface relative to the gap on the β2 Fermi surface for the B1g state.
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