Detailing of the "123" Raman continuum

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Abstract
Raman investigations on several of the high temperature superconductors have revealed an unusual background continuum. In the YBa2Cu3O' material ('123'), the continuum can be separated into two unique symmetries each having distinct normal state and superconducting state characteristics. To elucidate the intrinsic qualities of the normal state continuum we present Raman specira on '123' single crystals with critical temperatures in the range T =OK to T = 90K, and introduce a model which accurately describes the normal state temperature dependent trend of the response functions of Aig and Big symmetry for the 90K compound. To illustrate the superconducting state qualities, we present a comparison of the lowest temperature spectra for the 60K and 90K phases and show the temperature evolution of the Big spectra of the 60K sample.© (1990) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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