Raman spectra of Hg-based superconductors: Effect of oxygen defects
- Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart (Germany)
- Department of Physics and the Texas Center for Superconductivity at the University of Houston, Houston, Texas 77204-5932 (United States)
- 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, Vol. 54, Issue 9; Other Information: PBD: Sep 1996
- Country of Publication:
- United States
- Language:
- English
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