title: Negative quantum interference between the electronic Raman scattering processes of CuO chains and CuO2 planes of heavily overdoped (Y, Ca)Ba2Cu3O(7-delta).
abstract: We found a strong X-Y anisotropy of the pair-breaking peak in the Raman scattering of heavily overdoped (Y, Ca)Ba2Cu3O(7-delta) (T(c) = 65 K). The pair-breaking peak is radically suppressed in the YY-polarized spectrum. We ascribe this anomaly to the effect of quantum interference between the Raman processes of the CuO-chain and the CuO2-plane electronic excitations that might take place as a result of the increase in the transfer matrix due to overdoping.
authors.affiliation: Superconductivity Research Laboratory, ISTEC, 1-10-13 Shinonome, Tokyo 135-0062, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Masui
authors.forename: M
authors.initials: M
authors.lastname: Limonov
authors.forename: H
authors.initials: H
authors.lastname: Uchiyama
authors.forename: S
authors.initials: S
authors.lastname: Tajima
authors.forename: A
authors.initials: A
authors.lastname: Yamanaka