Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.197001
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Funding
- JSPS
- KEK-PF [2009S2-005]
- TRiP-JST
- JST-CREST
- MEXT of Japan
- CAS
- NSF
- MOST of China
- NSF of US
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [800641] Funding Source: National Science Foundation
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We have performed angle-resolved photoemission spectroscopy of the iron-chalcogenide superconductor Fe1.03Te0.7Se0.3 to investigate the electronic structure relevant to superconductivity. We observed a holelike Fermi surface (FS) and an electronlike FS at the Brillouin zone center and corner, respectively, which are nearly nested by the Q similar to (pi, pi) wave vector. We do not find evidence for the nesting instability with Q similar to (pi + delta, 0) reminiscent of the antiferromagnetic order in the parent compound Fe1+yTe. We have observed an isotropic superconducting (SC) gap along the holelike FS with the gap size Delta of similar to 4 meV (2 Delta/k(B)T(c) similar to 7), demonstrating the strong-coupling superconductivity. The observed similarity of low-energy electronic excitations between iron-chalcogenides and iron-arsenides strongly suggests that common interactions which involve Q similar to (pi, pi) scattering are responsible for the SC pairing.
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