J. Phys. IV France
Volume 12, Numéro 9, November 2002
Page(s) 317 - 317

J. Phys. IV France
12 (2002) Pr9-317
DOI: 10.1051/jp4:20020425

Electronic properties of (DMTSA)BF 4 at ambient pressure

M. Nagasawa1, K. Kawabata2, T. Sambongi3, P. Monceau4 and T. Otsubo5

1  Tokyo Denki University, 2-2 Nishikicyo, Kanda, Chiyoda, Tokyo 101-8457, Japan
2  Hokkaido University, Sapporo 060-0810, Japan
3  Hokkaido Information University, Ebetsu 069-8585, Japan
4  CRTBT, CNRS, Grenoble, France
5  Hiroshima University, Higasihiroshima, Japan

Organic conductor (DMTSA)BF 4 [DMTSA: 2,3dimethyl-tetra-sleno-antracene] is a compound composed of an electron donor DMTSA and a monovalent acceptor BF 4-. In the salt, the electronic system is expected to be the Mott-Hubbard insulator. However, its conductivity at room temperature is 200~400 $\Omega^{-1}$cm -1 and behaves metallic above $\sim $2OOK. At ambient pressure, we found anomalies both in the DC conductivity components and in the permittivity at ~80K, similar to those in (TMTTF) 2X associated with charge ordering at ~100K. In the insulating state under low pressure, we found that the sample shows non-linear conduction with threshold. We discuss the possible origin of the anomalies and the apparent similarity with the non-linear electric conduction by the density wave sliding.

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