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We present a Raman scattering study of Ca$_2$RuO$_4$, in which we investigatethe temperature-dependence of the lattice dynamics and the electron-phononinteraction below the metal-insulator transition temperature ({\it T}$_{\rmMI}$). Raman spectra obtained in a backscattering geometry with light polarizedin the ab-plane reveal 9 B$_{1g}$ phonon modes (140, 215, 265, 269, 292, 388,459, 534, and 683 cm$^{-1}$) and 9 A$_g$ phonon modes (126, 192, 204, 251, 304,322, 356, 395, and 607 cm$^{-1}$) for the orthorhombic crystal structure(Pbca$-$D$_{2h}^{15}$). With increasing temperature toward {\it T}$_{\rm MI}$,the observed phonon modes shift to lower energies and exhibit reduced spectralweights, reflecting structural changes associated with the elongation of theRuO$_6$ octahedra. Interestingly, the phonons exhibit significant increases inlinewidths and asymmetries for {\it T} $>$ {\it T}$_{\rm N}$. These resultsindicate that there is an increase in the effective number of electrons and theelectron-phonon interaction strengths as the temperature is raised through {\itT}$_{\rm N}$, suggesting the presence of orbital fluctuations in thetemperature regime {\it T}$_{\rm N}$ $<$ {\it T} $<$ {\it T}$_{\rm MI}$.Comment: 6 pages, 4 figure

physical review. b, condensed matter and materials physics

Lattice dynamics and the electron-phonon interaction in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Ca</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>RuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>

Lattice dynamics and the electron-phonon interaction inCa2RuO4