Symmetry breaking on the phonon Raman spectra only at the superconductor compositions in La2-xSrxCuO4

S. Sugai, S. Shamoto, M. Sato, T. Ido, H. Takagi, S. Uchida

研究成果: Article同行評審

37 引文 斯高帕斯(Scopus)

摘要

Phonons in La2-xSrxCuO4 were systematically investigated by Raman and infrared spectroscopy covering from the insulator, superconductor, to normal metal compositions. In the Raman spectra, modes which appear only at the superconductor compositions were found. Many of those modes were assigned to the infrared active transverse optical modes with the polarization vectors parallel to the CuO2 plane. The Raman and infrared activity is mutually exclusive in the crystal with inversion symmetry as in the present crystal structure. The appearance of the infrared active modes in the Raman spectra implies that the doped carriers take the states which break the inversion symmetry of phonons only at the superconductor compositions. The larger scattering intensity of those modes than of the natively active modes indicates that the deformation-potential-type electron-phonon interactions are very large. The experimental fact that the longitudinal optical modes do not appear in the Raman spectra indicates that the Fröhlich-type electron-phonon interactions induced by the macroscopic electric field of the longitudinal optical modes do not work.

原文English
頁(從 - 到)371-376
頁數6
期刊Solid State Communications
76
發行號3
DOIs
出版狀態Published - 1990 10月

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 凝聚態物理學
  • 材料化學

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