Observation of particle hole asymmetry and phonon excitations in non-Fermi-liquid systems: A high-resolution photoemission study of ruthenates

K. Maiti; R. S. Singh; V. R. R. Medicherla

doi:10.1209/0295-5075/78/17002

All issues

Volume 78 / No 1 (April 2007)

EPL, 78 1 (2007) 17002

Abstract

Issue		EPL Volume 78, Number 1, April 2007


Article Number		17002
Number of page(s)		5
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/78/17002
Published online		13 March 2007

EPL, 78 (2007) 17002

Observation of particle hole asymmetry and phonon excitations in non-Fermi-liquid systems: A high-resolution photoemission study of ruthenates

K. Maiti, R. S. Singh and V. R. R. Medicherla

Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research - Homi Bhabha Road, Colaba, Mumbai 400005, India

Corresponding author: kbmaiti@tifr.res.in

Received: 13 November 2006
Accepted: 13 February 2007

Abstract

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

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