2024-03-28T09:39:43Z
https://niigata-u.repo.nii.ac.jp/oai
oai:niigata-u.repo.nii.ac.jp:00002113
2022-12-15T03:34:58Z
176:488:489
453:454
A High-T_c Mechanism of Iron Pnictide Superconductivity due to Cooperation of Ferro-orbital and Antiferromagnetic Fluctuations
A High-T_c Mechanism of Iron Pnictide Superconductivity due to Cooperation of Ferro-orbital and Antiferromagnetic Fluctuations
Yamada, Takemi
7093
Ishizuka, Jun
7094
Ono, Yoshiaki
62
iron pnictide superconductors
d-p model
spin fluctuation
orbital fluctuation
elastic softening
The electronic states and superconductivity in iron pnictides are studied on the basis of the 16 band d-p model which includes both the onsite Coulomb interaction between Fe d electrons and the intersite one between Fe d and pnictogen p electrons. The model well accounts for experimentally observed two fluctuations: the d-d interaction-enhanced antiferromagnetic (AFM) fluctuation and the d-p interaction-enhanced ferro-orbital (FO) fluctuation responsible for the C_<66> elastic softening. The AFM fluctuation induces the repulsive pairing interaction for q ~ Q_<AF> while the FO does the attractive one for q ~ 0 resulting in the s_±-wave superconductivity where the two fluctuations cooperatively enhance the superconducting transition temperature T_c without any competition by virtue of the q-space segregation.
journal article
The Physical Society of Japan
2014-03
application/pdf
Journal of the Physical Society of Japan
4
83
043704-1
043704-4
Journal of the Physical Society of Japan
AA00704814
00319015
https://niigata-u.repo.nii.ac.jp/record/2113/files/83_043704.pdf
eng
info:doi/10.7566/JPSJ.83.043704
http://journals.jps.jp/doi/abs/10.7566/JPSJ.83.043704
Copyright (C) 2014 The Physical Society of Japan