Evidence for a Peierls distortion in La2CuO4 from vibrational spectroscopy

Michael Stavola, R. J. Cava, E. A. Rietman

Research output: Contribution to journalArticlepeer-review

77 Scopus citations


Two features have been observed in the infrared absorption spectrum of the new superconductors La2-xSrxCuO4. The higher-frequency feature at 677 cm-1 in La2CuO4 dominates the spectrum for x=0. However, small Sr replacements (x0.03) cause the 677-cm-1 band to be reduced dramatically in intensity and to disappear entirely by x=0.15. We propose that this is a zone-boundary phonon that is folded to the center of the zone and that the frozen-in charge-densitywave distortion proposed by Mattheiss gives rise to the strong transition moment we observe. Sr doping suppresses this distortion.

Original languageEnglish (US)
Pages (from-to)1571-1573
Number of pages3
JournalPhysical review letters
Issue number15
StatePublished - 1987
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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