Volume 78, Number 1, April 2007
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||13 March 2007|
Observation of particle hole asymmetry and phonon excitations in non-Fermi-liquid systems: A high-resolution photoemission study of ruthenates
Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research - Homi Bhabha Road, Colaba, Mumbai 400005, India
Corresponding author: email@example.com
Accepted: 13 February 2007
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.
PACS: 71.10.Hf – Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems / 63.20.Kr – Phonon-electron and phonon-phonon interactions / 71.45.Gm – Exchange, correlation, dielectric and magnetic response functions, plasmons
© Europhysics Letters Association, 2007
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