  We investigate the temperature evolution of the electronic states in the
vicinity of the Fermi level of a non-Fermi liquid (NFL) system, CaRuO3 using
ultra high-resolution photoemission spectroscopy; isostructural SrRuO3
exhibiting Fermi liquid behavior despite similar electron interaction
parameters as that of CaRuO3, is used as a reference. High-energy resolution in
this study helps to reveal particle-hole asymmetry in the excitation spectra of
CaRuO3 in contrast to that in SrRuO3. In addition, we observe signature of
phonon excitations in the photoemission spectra of CaRuO3 at finite
temperatures while these are weak in SrRuO3.
