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Science 7 January 2005:
Vol. 307. no. 5706, pp. 86 - 89
DOI: 10.1126/science.1105067
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Reports

Gigantic Photoresponse in 1/4-Filled-Band Organic Salt (EDO-TTF)2PF6

Matthieu Chollet,1 Laurent Guerin,1,2 Naoki Uchida,1 Souichi Fukaya,1 Hiroaki Shimoda,1 Tadahiko Ishikawa,1 Kazunari Matsuda,3 Takumi Hasegawa,4 Akira Ota,5 Hideki Yamochi,6,8 Gunzi Saito,5 Ryoko Tazaki,7,8,9 Shin-ichi Adachi,7,8 Shin-ya Koshihara1,7,8*

We report that the organic salt (EDO-TTF)2PF6 with 3/4-filled-band (1/4-filled in terms of holes), which forms an organic metal with strong electron and lattice correlation, shows a highly sensitive response to photoexcitation. An ultrafast, photoinduced phase transition from the insulator phase to the metal phase can be induced with very weak excitation intensity at near room temperature. This response makes the material attractive for applications in switching devices with room-temperature operation. The observed photo-induced spectroscopic change shows that this photoinduced phase transition process is caused by the cooperative melting of charge ordering assisted by coherent phonon generation.

1 Department of Materials Science, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan.
2 Groupe Matière Condensée et Matériaux, Centre National de la Recherche Scientifique, Unite Mixte de Recherche-6626, Université de Rennes 1, Rennes, France.
3 Kanagawa Academy of Science and Technology and Japan Science and Technology Agency (JST), Precursory Research for Embryonic Science and Technology (PRESTO), 3-2-1, Sakado, Takatsu-ku, Kawasaki 213-0012, Japan.
4 Department of Physics, Tokyo Institute of Technology, Japan.
5 Division of Chemistry, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.
6 Research Center for Low Temperature and Materials Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.
7 High Energy Accelerator Research Organization (KEK), 1-1 O-ho, Tsukuba 305-0801, Japan.
8 JST, Exploratory Research for Advanced Technology (ERATO), 1-1 O-ho, Tsukuba 305-0801, Japan.
9 Graduate School of Science and Technology, Chiba University 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.

* To whom correspondence should be addressed. E-mail: skoshi{at}cms.titech.ac.jp

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Transient Electronic Structure and Melting of a Charge Density Wave in TbTe3.
F. Schmitt, P. S. Kirchmann, U. Bovensiepen, R. G. Moore, L. Rettig, M. Krenz, J.-H. Chu, N. Ru, L. Perfetti, D. H. Lu, et al. (2008)
Science 321, 1649-1652
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