Abstract
We study the five-orbital Hubbard model including the charge quadrupole interaction for iron pnictides. Using the fluctuation-exchange approximation, orbital fluctuations evolve inversely proportional to the temperature, and therefore the resistivity shows linear or convex T dependence for a wide range of temperatures. We also analyze the Eliashberg gap equation, and show that an s-wave superconducting state without sign reversal (s ++-wave state) emerges when the orbital fluctuations dominate over the spin fluctuations. When both fluctuations are comparable, their competition gives rise to a nodal s-wave state. The present study offers us a unified explanation for both the normal and superconducting states.
| Original language | English |
|---|---|
| Article number | 134507 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 85 |
| Issue number | 13 |
| DOIs | |
| Publication status | Published - Apr 9 2012 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
Cite this
Non-Fermi-liquid transport phenomena and superconductivity driven by orbital fluctuations in iron pnictides : Analysis by fluctuation-exchange approximation. / Onari, Seiichiro; Kontani, Hiroshi.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 85, No. 13, 134507, 09.04.2012.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Non-Fermi-liquid transport phenomena and superconductivity driven by orbital fluctuations in iron pnictides
T2 - Analysis by fluctuation-exchange approximation
AU - Onari, Seiichiro
AU - Kontani, Hiroshi
PY - 2012/4/9
Y1 - 2012/4/9
N2 - We study the five-orbital Hubbard model including the charge quadrupole interaction for iron pnictides. Using the fluctuation-exchange approximation, orbital fluctuations evolve inversely proportional to the temperature, and therefore the resistivity shows linear or convex T dependence for a wide range of temperatures. We also analyze the Eliashberg gap equation, and show that an s-wave superconducting state without sign reversal (s ++-wave state) emerges when the orbital fluctuations dominate over the spin fluctuations. When both fluctuations are comparable, their competition gives rise to a nodal s-wave state. The present study offers us a unified explanation for both the normal and superconducting states.
AB - We study the five-orbital Hubbard model including the charge quadrupole interaction for iron pnictides. Using the fluctuation-exchange approximation, orbital fluctuations evolve inversely proportional to the temperature, and therefore the resistivity shows linear or convex T dependence for a wide range of temperatures. We also analyze the Eliashberg gap equation, and show that an s-wave superconducting state without sign reversal (s ++-wave state) emerges when the orbital fluctuations dominate over the spin fluctuations. When both fluctuations are comparable, their competition gives rise to a nodal s-wave state. The present study offers us a unified explanation for both the normal and superconducting states.
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U2 - 10.1103/PhysRevB.85.134507
DO - 10.1103/PhysRevB.85.134507
M3 - Article
AN - SCOPUS:84860169882
VL - 85
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 13
M1 - 134507
ER -