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Correlation gap in the optical spectra of the two-dimensional organic metal (BEDTTTF)4[Ni(dto)2]

P. Haas, E. Griesshaber, B. Gorshunov, D. Schweitzer, M. Dressel, T. Klausa, W. Strunz, and F. F. Assaad
Phys. Rev. B 62, R14673(R) – Published 1 December 2000
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Abstract

Optical reflection measurements within the highly conducting (a,b) plane of the organic metal (BEDTTTF)4[Ni(dto)2] reveal the gradual development of a sharp feature at around 200 cm1 as the temperature is reduced below 150 K. Below this frequency a narrow Drude-like response is observed which accounts for the metallic behavior. Since de Haas–van Alphen oscillations at low temperatures confirm band structure calculations of bands crossing the Fermi energy, we assign the observed behavior to a two-dimensional metallic state in the proximity of a correlation induced metal-insulator transition.

  • Received 25 August 2000

DOI:https://doi.org/10.1103/PhysRevB.62.R14673

©2000 American Physical Society

Authors & Affiliations

P. Haas1, E. Griesshaber1, B. Gorshunov1,*, D. Schweitzer1, M. Dressel1,†, T. Klausa2, W. Strunz2, and F. F. Assaad3

  • 1Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
  • 2Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuheimer Feld 270, D-69120 Heidelberg, Germany
  • 3Institut für Theoretische Physik III, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany

  • *Permanent address: General Physics Institute, Russian Academy of Sciences, Moscow, Russia.
  • Email address: dressel@pi1.physik.uni-stuttgart.de

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Vol. 62, Iss. 22 — 1 December 2000

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