期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 79, 期 12, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.79.123707
关键词
iron pnictides; superconductivity; elastic softening; structural transition; orbital order
资金
- Ministry of Education, Culture, Sports, Science and Technology
We investigate the 16-band d-p model for iron pnictide superconductors in the presence of the electron-phonon coupling g with the orthorhombic mode which is crucial for reproducing the recently observed ultrasonic softening. Within the RPA, we obtain the ferro-orbital order below T-Q which induces the tetragonal-orthorhombic structural transition at T-s = T-Q, together with the stripe-type antiferro-magnetic order below T-N. Near the phase transitions, the system shows the s(++)-wave superconductivity due to the orbital fluctuation for a large g case with T-Q > T-N, while the s(+/-)-wave due to the magnetic fluctuation for a small g case with T-Q <= T-N. The former case is consistent with the phase diagram of doped iron pnictides with T-s > T-N.
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