Plane-polarized Raman continuum in the insulating and superconducting layered cuprates

D. Reznik, S. L. Cooper, M. V. Klein, W. C. Lee, D. M. Ginsberg, A. A. Maksimov, A. V. Puchkov, I. I. Tartakovskii, S. W. Cheong

Research output: Contribution to journalArticlepeer-review


Electronic properties of copper oxygen planes (and chains in Y-Ba-Cu-O) were studied with Raman spectroscopy of plane-polarized photons. The electronic continuum was found to be independent of doping in 2:1:4 and 1:2:3 materials at energies above ∼1000 cm-1. Temperature dependence at low energies differs significantly in undoped, lightly doped, and fully doped YBa2Cu3O6+x. A feature consistent with the superconducting gap was observed below Tc in YBa2Cu3O6.9 in all scattering geometries. However, the gaplike redistribution was not complete, with 40-60 % of states not shifted to higher energies at temperatures well below Tc. Above Tc the temperature dependence strongly depends on scattering geometry: the continuum is temperature independent (marginal-Fermi-liquid-like) in XX (x2) and X'X' (x2+y2) geometry; it has a Bose-factor temperature dependence in X'Y' (x2-y2) geometry, and a weak temperature dependence somewhat smaller than the Bose factor in YY (y2) geometry. A two-boson-like temperature dependence of the low-energy continuum is found in YBa2Cu3O6.1 and Sm2CuO4. It becomes one-particle-like in Y-Ba-Cu-O once small doping levels are introduced. Constraints these results place on theoretical models are discussed.

Original languageEnglish (US)
Pages (from-to)7624-7635
Number of pages12
JournalPhysical Review B
Issue number10
StatePublished - 1993

ASJC Scopus subject areas

  • Condensed Matter Physics


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