Raman spectra of high temperature superconductors

Marvin V. Klein, S Lance Cooper, F. Slakey, E. D. Bukowski, J. P. Rice, D. M. Ginsberg

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The results of Raman scattering from phonons and superconducting gap excitations in the high-Tc compounds YBa2 Cu3 O7-δ and Bi2 Sr2 CaCu2 O8+Δ are presented and compared. In the normal state, both materials exhibit strong electronic interband scattering, which manifests itself as a broad background continuum having both A1g and B1g symmetry components. At low temperature there occurs a redistribution of this electronic scattering with the formation of a broad pronounced peak. This may indicate the formation of a superconducting gap in these compounds. The two symmetries exhibit a distinctly different redistribution, however, implying strong anisotropy. At temperatures well below Tc, both compounds exhibit residual low-energy scattering, a feature suggestive of the coexistence of normal electrons and superconducting quasiparticles. Phonon modes at 115 and 330 cm-1 in YBa2 Cu3 O7-δ show antiresonances with the continuum corroborating the redistribution of the continuum from low to higher frequencies as the gap forms.

Original languageEnglish (US)
Title of host publicationQuantum Electron Laser Sci Conf
Editors Anon
PublisherPubl by IEEE
Number of pages1
StatePublished - Dec 1 1989
EventQuantum Electronics and Laser Science Conference - Baltimore, MD, USA
Duration: Apr 24 1989Apr 28 1989

Other

OtherQuantum Electronics and Laser Science Conference
CityBaltimore, MD, USA
Period4/24/894/28/89

ASJC Scopus subject areas

  • Engineering(all)

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