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APS » Journals » Phys. Rev. Lett. » Volume 98 » Issue 9
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Phys. Rev. Lett. 98, 097402 (2007) [4 pages]

Photoinduced Melting of a Stripe-Type Charge-Order and Metallic Domain Formation in a Layered BEDT-TTF-Based Organic Salt

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S. Iwai1,2,*, K. Yamamoto3, A. Kashiwazaki1, F. Hiramatsu1, H. Nakaya1, Y. Kawakami1, K. Yakushi3, H. Okamoto4,5, H. Mori6, and Y. Nishio7
1Department of Physics, Tohoku University, Sendai 980-8578, Japan
2PRESTO-JST, Kawaguchi 332-0012, Japan
3Institute of Molecular Science, Okazaki 444-8585, Japan
4Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
5CREST-JST, Kawaguchi 332-0012, Japan
6Institute of Solid State Physics, University of Tokyo, Kashiwa 277-8561, Japan
7Department of Physics, Toho University, Chiba 274-8510, Japan

Received 14 April 2006; published 1 March 2007

Photoinduced melting of charge-order (CO) in [bis(ethylenedithiolo)]-tetrathiafulvalene (BEDT-TTF) salts was investigated by femotosecond spectroscopy. Comparative studies on two polytypes exhibiting large [θ-(BEDT-TTF)2RbZn(SCN)4] and small [α-(BEDT-TTF)2I3] molecular rearrangements through the CO transition were performed. Ultrafast melting of CO for both compounds demonstrates the major contribution of the electronic instability which is due to Coulomb interaction. The roles of the molecular rearrangements on the formation of the CO and the metallic domain are discussed on the basis of low-frequency lattice dynamics.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.097402
DOI:
10.1103/PhysRevLett.98.097402
PACS:
78.55.Kz, 73.20.Mf, 78.47.+p

*Electronic address: s.iwai@sspp.phys.tohoku.ac.jp

 
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