Journal
PHYSICAL REVIEW B
Volume 81, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.054518
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Funding
- Ministry of Education, Culture, Sports, Science and Technology
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We study superconductivity in the two-dimensional 16-band d-p model extracted from a tight-binding fit to the band structure of LaFeAsO, using the random phase approximation. When the intraorbital repulsion U is larger than the interorbital one U', an extended s-wave (s(+/-)-wave) pairing with sign reversal of order parameter is mediated by antiferromagnetic spin fluctuations, while when U < U' another kind of s-wave (s(++)-wave) pairing without sign reversal is mediated by ferro-orbital fluctuations. The s(++)-wave pairing is enhanced due to the electron-phonon coupling and then can be expanded over the realistic parameter region with U > U'.
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