TY - JOUR
T1 - Local correlation effects on the s±- and s±-wave superconductivities mediated by magnetic and orbital fluctuations in the five-orbital hubbard model for iron pnictides
AU - Ishizuka, Jun
AU - Yamada, Takemi
AU - Yanagi, Yuki
AU - Ono, Yoshiaki
PY - 2013/12
Y1 - 2013/12
N2 - We investigate the electronic state and the superconductivity in the five-orbital Hubbard model for iron pnictides by using the dynamical mean-field theory in conjunction with the Eliashberg equation. The renormalization factor exhibits significant orbital dependence resulting in the large change in the band dispersion as observed in recent ARPES experiments. The critical interactions towards the magnetic, orbital and superconducting instabilities are suppressed as compared with those from the random phase approximation (RPA) due to local correlation effects. Remarkably, the s-pairing phase due to the orbital fluctuation is largely expanded relative to the RPA result, while the s±-pairing phase due to the magnetic fluctuation is reduced.
AB - We investigate the electronic state and the superconductivity in the five-orbital Hubbard model for iron pnictides by using the dynamical mean-field theory in conjunction with the Eliashberg equation. The renormalization factor exhibits significant orbital dependence resulting in the large change in the band dispersion as observed in recent ARPES experiments. The critical interactions towards the magnetic, orbital and superconducting instabilities are suppressed as compared with those from the random phase approximation (RPA) due to local correlation effects. Remarkably, the s-pairing phase due to the orbital fluctuation is largely expanded relative to the RPA result, while the s±-pairing phase due to the magnetic fluctuation is reduced.
KW - Dynamical mean-field theory
KW - Five-orbital Hubbard model
KW - Iron-based superconductor
KW - Orbital fluctuation
KW - Spin fluctuation
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U2 - 10.7566/JPSJ.82.123712
DO - 10.7566/JPSJ.82.123712
M3 - Article
AN - SCOPUS:84890944838
VL - 82
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 12
M1 - 123712
ER -