title: Real-space coexistence of the melted Mott state and superconductivity in Fe-substituted 1T-TaS2.
abstract: We have performed high-resolution angle-resolved photoemission spectroscopy of layered chalcogenide 1T-Fe(x)Ta(1-x)S(2) which undergoes a superconducting transition in the nearly commensurate charge-density-wave phase (melted Mott phase). We found a single electron pocket at the Brillouin-zone center in the melted Mott phase, which is created by the backfolding of bands due to the superlattice potential of charge-density-wave. This electron pocket appears in the x region where the samples show superconductivity, and is destroyed by the Mott- and Anderson-gap opening. Present results suggest that the melted Mott state and the superconductivity coexist in real space, providing a new insight into the interplay between electron correlation, charge order, and superconductivity.
authors.affiliation: WPI Research Center, Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Ang
authors.forename: Y
authors.initials: Y
authors.lastname: Tanaka
authors.forename: E
authors.initials: E
authors.lastname: Ieki
authors.forename: K
authors.initials: K
authors.lastname: Nakayama
authors.forename: T
authors.initials: T
authors.lastname: Sato
authors.forename: L J
authors.initials: LJ
authors.lastname: Li
authors.forename: W J
authors.initials: WJ
authors.lastname: Lu
authors.forename: Y P
authors.initials: YP
authors.lastname: Sun
authors.forename: T
authors.initials: T
authors.lastname: Takahashi