TY - JOUR
T1 - Two types of s-wave pairing due to magnetic and orbital fluctuations in the two-dimensional 16-band d-p model for iron-based superconductors
AU - Yanagi, Yuki
AU - Yamakawa, Youichi
AU - Ono, Yoshiaki
PY - 2010/2/23
Y1 - 2010/2/23
N2 - 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′.
AB - 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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U2 - 10.1103/PhysRevB.81.054518
DO - 10.1103/PhysRevB.81.054518
M3 - Article
AN - SCOPUS:77954821160
VL - 81
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 5
M1 - 054518
ER -