title: On properly integrating the electronic Raman and optical infra-red spectra of high temperature superconducting cuprate materials.
abstract: New electronic Raman and infra-red spectroscopy results from optimally and overdoped high temperature superconducting cuprate systems are interpreted in terms of the negative- U, boson-fermion crossover model. A distinction is made between those features which follow the condensate gap, 2Δ(p), and those that are set by the local pair binding energy, [Formula: see text]. The critical role of the doping level p(c) = 0.185 is highlighted in conjunction with the question of developing quasiparticle incoherence, making connection here with recent transport and related results. [Formula: see text] IR results for magnetic fields parallel and perpendicular to  c prove particularly illuminating. The general scheme developed continues to embrace all experimental data very satisfactorily.
authors.affiliation: H H Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK.
authors.forename: John A
authors.initials: JA
authors.lastname: Wilson