Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 82, Issue 8, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.82.083702
Keywords
iron pnictide superconductors; Fermi surface; spin fluctuation; first-principles band calculation
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Funding
- JSPS [24340079]
- JSPS FIRST Program
- Grants-in-Aid for Scientific Research [13J08570] Funding Source: KAKEN
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We theoretically study the spin fluctuation and superconductivity in La1111 and Sm1111 iron-based superconductors for a wide range of electron doping. When we take into account the band structure variation by electron doping, the hole Fermi surface originating from the d(x2-y2) orbital turns out to be robust against electron doping, and this gives rise to large spin fluctuations and consequently s +/- pairing even in the heavily doped regime. The stable hole Fermi surface is larger for Sm1111 than for La1111, which can be considered as the origin of the apparent difference in the phase diagram.
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