Phonon Raman scattering of Sr₂RuO₄

Phonon Raman scattering spectra of Sr2RuO4 have been measured in the temperature region between room temperature and 5 K. Three symmetry-allowed phonons have been observed at room temperature. Since similar spectra have been observed at low temperature, Sr2RuO4 does not undergo structural phase transitions in the temperature region. The energy of the phonon modes has been calculated by a GF matrix method. The force constants along the c-axis of Sr2RuO4 are larger than those for La2 - xSrxCuO4.