Raman spectra of Hg-based superconductors: Effect of oxygen defects

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.6137· OSTI ID:383239

Zhou, X; Cardona, M ^[1]; Chu, C W; Lin, Q M ^[2]; Loureiro, S M; Marezio, M ^[3]

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1. Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart (Germany)
2. Department of Physics and the Texas Center for Superconductivity at the University of Houston, Houston, Texas 77204-5932 (United States)
3. Laboratoire de Cristallographie, CNRS-Universite Joseph Fourier, BP 166, 38042 Grenoble Cedex 09 (France)

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.}

• OSTI ID: 383239
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 54; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARIUM OXIDES
CRYSTAL DEFECTS
CUPRATES
HIGH-TC SUPERCONDUCTORS
INTERSTITIALS
MERCURY OXIDES
OPTICAL PHONONS
OXYGEN
PHONONS
RAMAN SPECTRA