Absence of Quasiparticles in the Photoemission Spectra of Quasi-one-dimensional Bechgaard Salts

F. Zwick; S. Brown; G. Margaritondo; C. Merlic; M. Onellion; J. Voit; M. Grioni

doi:10.1103/PhysRevLett.79.3982

Absence of Quasiparticles in the Photoemission Spectra of Quasi-one-dimensional Bechgaard Salts

F. Zwick, S. Brown, G. Margaritondo, C. Merlic, M. Onellion, J. Voit, and M. Grioni

Phys. Rev. Lett. 79, 3982 – Published 17 November 1997

Abstract

We measured typical quasi-one-dimensional organic metals (Bechgaard salts), using high resolution angle-resolved photoemission spectroscopy. We observe neither quasiparticle features near the chemical potential nor traces of a Fermi surface. The spectra, indicating a deep pseudogap around the Fermi energy, are incompatible with a Fermi liquid picture. None of the alternative interpretations we explored can fully explain the experimental data.

Received 30 June 1997

DOI:https://doi.org/10.1103/PhysRevLett.79.3982

Authors & Affiliations

F. Zwick¹, S. Brown², G. Margaritondo¹, C. Merlic³, M. Onellion⁴, J. Voit⁵, and M. Grioni¹

¹Institut de Physique Appliquée, Ecole Polytechnique Fédérale, CH-1015 Lausanne, Switzerland
²Department of Physics, University of California, Los Angeles, California 90095-1547
³Department of Chemistry, University of California, Los Angeles, California 90095-1547
⁴Department of Physics, University of Wisconsin, Madison, Wisconsin 53706
⁵Theoretische Physik 1, Universität Bayreuth, D-95440 Bayreuth, Germany