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Phys. Rev. B 72, 052510 (2005) [4 pages]

Charge ordering and pressure-induced superconductivity in β″-(DODHT)2PF6

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H. Nishikawa1,*, Y. Sato2, K. Kikuchi2, T. Kodama2, I. Ikemoto2, J. Yamada3, H. Oshio1, R. Kondo4, and S. Kagoshima4
1Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
2Graduate School of Science, Tokyo Metropolitan University, Hachiohji, Tokyo 192-0397, Japan
3Department of Material Science, Graduate School of Material Science, University of Hyogo, Ako-gun, Hyogo 678-1297, Japan
4Department of Art and Science, University of Tokyo, Komaba, Tokyo 153-8902, Japan

Received 16 February 2005; published 25 August 2005

Transport measurements of a pressure-induced organic superconductor, β″-(DODHT)2PF6 [DODHT=(1,4-dioxane-2,3-diyldithio)dihydrotetrathiafulvalene], were performed under various pressures to obtain a pressure-temperature phase diagram. The pressure application of 13.2 kbar induced superconductivity at 2.3 K. Due to a fractional existence of superconductivity, a resistive state was observed with decreasing temperature in a narrow pressure range above 13.2 kbar. X-ray and magnetic measurements at ambient pressure revealed that the insulating state has a charge disproportionation, or a charge ordering (CO) state, with stripes along the molecular side-by-side direction. These results suggest that the charge fluctuation may play a crucial role in the superconductivity in β″-(DODHT)2PF6.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.052510
DOI:
10.1103/PhysRevB.72.052510
PACS:
74.70.Kn, 71.30.+h, 74.25.Dw

*Electronic address: nishikaw@chem.tsukuba.ac.jp

 
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