Raman spectra of YBa2 Cu3 O7 excited by different lines of Ar and Kr lasers have been studied. It was found that significant changes in relative intensity of phonon lines occurred in the spectra when the excitation frequency was shifted from the red into the blue region of the spectrum. The enhancement of high‐frequency phonons, which involves stretching of CuO bonds, was attributed to resonance with an interband transition in YBa2 Cu3 O7 .
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© 1989 American Institute of Physics.
1989
American Institute of Physics
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