Abstract
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 TQ which induces the tetragonal-orthorhombic structural transition at Ts - TQ, together with the stripe-type antiferromagnetic order below TN. Near the phase transitions, the system shows the s++-wave superconductivity due to the orbital fluctuation for a large g case with T q > TN, while the s±-wave due to the magnetic fluctuation for a small g case with TQ ≤ TN. The former case is consistent with the phase diagram of doped iron pnictides with Ts > TN.
| Original language | English |
|---|---|
| Article number | 123707 |
| Journal | journal of the physical society of japan |
| Volume | 79 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2010 Dec 1 |
| Externally published | Yes |
Keywords
- Elastic softening
- Iron pnictides
- Orbital order
- Structural transition
- Superconductivity
ASJC Scopus subject areas
- Physics and Astronomy(all)
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Yanagi, Y., Yamakawa, Y., Adachi, N., & Ono, Y. (2010). Orbital order, structural transition, and superconductivity in iron pnictides. journal of the physical society of japan, 79(12), [123707]. https://doi.org/10.1143/JPSJ.79.123707