Orbital order, structural transition, and superconductivity in iron pnictides

Yuki Yanagi, Youichi Yamakawa, Naoko Adachi, Yoshiaki Ono

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48 Citations (Scopus)


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 languageEnglish
Article number123707
Journaljournal of the physical society of japan
Issue number12
Publication statusPublished - 2010 Dec
Externally publishedYes


  • Elastic softening
  • Iron pnictides
  • Orbital order
  • Structural transition
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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