title: Two- to three-dimensional crossover in the electronic structure of (Bi, Pb)2(Sr, La)2CuO(6+delta) from angle-resolved photoemission spectroscopy.
abstract: The hole-concentration (x) dependence of the three-dimensional energy-momentum dispersion in (Bi, Pb)2(Sr, La)2CuO(6+delta) has been investigated by angle-resolved photoemission spectroscopy. For a heavily overdoped sample of T(c) < or = 0.5 K, an energy dispersion of approximately 10 meV in width is observed in the vicinity of the (pi, 0) point with varying momentum along the c axis (k(z)). This k(z) dispersion is zero for underdoped, optimally doped, and slightly overdoped samples up to a doping level corresponding to T(c) = 22 k. At higher doping levels we observe significant dispersion of the order of 10 meV (sample with T(c) < or = 0.5 K). This is clear evidence that at a doping value corresponding to T(c) = 22 K, a crossover from two- to three-dimensional electronic structure occurs.
authors.affiliation: EcoTopia Science Institute, Nagoya University, Nagoya 464-8603, Japan.
authors.forename: Tsunehiro
authors.initials: T
authors.lastname: Takeuchi
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kondo
authors.forename: Takio
authors.initials: T
authors.lastname: Kitao
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kaga
authors.forename: Hongbo
authors.initials: H
authors.lastname: Yang
authors.forename: Hong
authors.initials: H
authors.lastname: Ding
authors.forename: Adam
authors.initials: A
authors.lastname: Kaminski
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Campuzano