Abstract
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 language | English (US) |
---|---|
Pages (from-to) | 1571-1573 |
Number of pages | 3 |
Journal | Physical review letters |
Volume | 58 |
Issue number | 15 |
DOIs | |
State | Published - 1987 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)