Structural transition, ferro-orbital order and its fluctuation-mediated s++-wave superconductivity in iron pnictides
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Abstract
We investigate the electronic states and the superconductivity in the two-dimensional 16-band d–p model extracted from a tight-binding fit to the band structure of iron pnictides, in the presence of both the Coulomb interaction between Fe d-electrons and the electron–lattice coupling g with the orthorhombic mode which is crucial for reproducing the recently observed ultrasonic softening of the elastic constant C66. Due to the cooperative effects of these interactions, the ferro-orbital order with different occupations of dyz and xdzx orbitals occurs and induces the tetragonal-orthorhombic structural transition at Ts, together with the stripe-type antiferromagnetic (AFM) order below TNTN. For a large gg case, we obtain the phase diagram consistent with the doped iron pnictides with Ts>TN for x>0, where the s++-wave superconductivity is mediated by the ferro-orbital fluctuation which is largely enhanced near the ferro-orbital QCP at Xc with Ts→0. On the other hand, for a small g case, the simultaneous phase transition occurs at Ts=TN even for x>0, where the s±-wave superconductivity is mediated by the AFM fluctuation. Both the s-wave states with full superconducting gaps are consistent with most of the experiments but only the former is considered to account for the small Tc-suppression against nonmagnetic impurities.
Journal
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- Solid State Communications
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Solid State Communications 152 (8), 701-710, 2012-04
Elsevier
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Keywords
Details 詳細情報について
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- CRID
- 1050845764171133568
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- NII Article ID
- 120006746836
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- NII Book ID
- AA00844573
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- ISSN
- 00381098
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- HANDLE
- 10191/26914
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- CiNii Articles