Spin-density-wave gap in the Bechgaard salts (TMTSF)2X

V. Vescoli, L. Degiorgi, M. Dressel, A. Schwartz, W. Henderson, B. Alavi, G. Grüner, J. Brinckmann, and A. Virosztek
Phys. Rev. B 60, 8019 – Published 15 September 1999
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Abstract

The electrodynamic response of the organic linear chain Bechgaard salts (TMTSF)2X (X=PF6 and ClO4) has been investigated over a very broad spectral range by applying a variety of optical spectroscopic tools. We focus our attention on the spin-density-wave ground state and, in particular, on its manifestation in the optical properties, with polarization perpendicular to the chains. Along this direction, we have clearly identified the spin-density-wave gap in the optical spectra of both compounds. We discuss the single particle excitation across the gap within a formalism similar to the one worked out for the superconducting state, but with Bardeen-Cooper-Schrieffer case I coherence factors, as well as an approach based on the two-dimensional Hubbard model.

  • Received 2 November 1998

DOI:https://doi.org/10.1103/PhysRevB.60.8019

©1999 American Physical Society

Authors & Affiliations

V. Vescoli and L. Degiorgi

  • Laboratorium für Festkörperphysik ETH-Zürich, CH-8093 Zürich, Switzerland

M. Dressel

  • Physikalisches Institut, Universität Stuttgart, D-70550 Stuttgart, Germany

A. Schwartz*, W. Henderson, B. Alavi, and G. Grüner

  • Department of Physics, University of California at Los Angeles, Los Angeles, California 90095-1547

J. Brinckmann

  • Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

A. Virosztek

  • Institute of Physics, Technical University of Budapest, H-1111 Budapest, Hungary
  • Research Institute for Solid State Physics, P.O. Box 49, H-1525 Budapest, Hungary

  • *Present address: Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742-4111.
  • Present address: Condensed Matter Theory, University of Karlsruhe, D-76128 Karlsruhe, Germany.

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Vol. 60, Iss. 11 — 15 September 1999

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