title: Angle-resolved photoemission study of insulating and metallic Cu-O chains in PrBa2Cu3O7 and PrBa2Cu4O8
abstract: We compare the angle-resolved photoemission spectra of the hole-doped Cu-O chains in PrBa2Cu3O7 (Pr123) and in PrBa2Cu4O8 (Pr124). While, in Pr123, a dispersive feature from the chain takes a band maximum at k(b) (momentum along the chain) approximately pi/4 and loses its spectral weight around the Fermi level, it reaches the Fermi level at k(b) approximately pi/4 in Pr124. Although the chains in Pr123 and Pr124 are approximately 1/4 filled, they show contrasting behaviors: While the chains in Pr123 have an instability to charge ordering, those in Pr124 avoid it and show an interesting spectral feature of a metallic coupled-chain system.
authors.affiliation: Department of Complexity Science and Engineering, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan and Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.initials: T
authors.lastname: Mizokawa
authors.initials: C
authors.lastname: Kim
authors.initials: ZX
authors.lastname: Shen
authors.initials: A
authors.lastname: Ino
authors.initials: T
authors.lastname: Yoshida
authors.initials: A
authors.lastname: Fujimori
authors.initials: M
authors.lastname: Goto
authors.initials: H
authors.lastname: Eisaki
authors.initials: S
authors.lastname: Uchida
authors.initials: M
authors.lastname: Tagami
authors.initials: K
authors.lastname: Yoshida
authors.initials: AI
authors.lastname: Rykov
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authors.lastname: Siohara
authors.initials: K
authors.lastname: Tomimoto
authors.initials: S
authors.lastname: Tajima
authors.initials: Y
authors.lastname: Yamada
authors.initials: S
authors.lastname: Horii
authors.initials: N
authors.lastname: Yamada
authors.initials: Y
authors.lastname: Yamada
authors.initials: I
authors.lastname: Hirabayashi