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Author Zhou, X. ♦ Cardona, M. ♦ Chu, C. W. ♦ Lin, Q. M. ♦ Loureiro, S. M. ♦ Marezio, M.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ HIGH-TC SUPERCONDUCTORS ♦ RAMAN SPECTRA ♦ CUPRATES ♦ MERCURY OXIDES ♦ BARIUM OXIDES ♦ PHONONS ♦ INTERSTITIALS ♦ OXYGEN ♦ CRYSTAL DEFECTS ♦ OPTICAL PHONONS
Abstract Polarized micro-Raman scattering measurements have been performed on the five members of the HgBa{sub 2}Ca{sub {ital n}{minus}1}Cu{sub {ital n}}O{sub 2{ital n}+2+{delta}} ({ital n}=1, 2, 3, 4, and 5) high-{ital T}{sub {ital c}} superconductor family. A systematic evolution of the spectrum, which mainly involves oxygen-related phonons around 590, 570, 540, and 470 cm{sup {minus}1}, with an increasing number of CuO{sub 2} layers, has been observed. Local laser annealing measurements clearly demonstrate that all these phonons are closely related to interstitial oxygen in the HgO{sub {delta}} planes. The origin of the spectrum evolution with the number of CuO{sub 2} layers lies in the variation of interstitial oxygen content. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-09-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 54
Issue Number 9


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