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J. Phys. Soc. Jpn. 81 (2012) 023705 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Tc of 11 K Identified for the Third Polymorph of the (BEDT-TTF)2Ag(CF3)4(TCE) Organic Superconductor

Tadashi Kawamoto, Takehiko Mori, Akiko Nakao1, Youichi Murakami1, and John A. Schlueter2

Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan
1Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
2Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, U.S.A.

(Received October 6, 2011; Accepted December 5, 2011; Published January 16, 2012)

The crystal structure of the third polymorph of the organic superconductor (BEDT-TTF)2Ag(CF3)4(TCE), where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene and TCE is 1,1,2-trichloroethane, has been investigated. The crystal consists of alternating stacks of two types of donor sheets, κ- and α′-types. Although this structure is similar to the previously solved two-layered high-Tc phase of (BEDT-TTF)2Ag(CF3)4(TCE), the axis perpendicular to the conducting layer of the unit cell of the new phase is twice as large as that of the two-layered phase; thus, four layers form the repeating unit. Superconductivity is attributed to the κ-type conducting layer, because the α′-type conducting layer is in an acentric charge-ordered state. The onset superconducting transition temperatures are approximately 11.0 and 9.5 K for the four-layered and two-layered phases, respectively. ©2012 The Physical Society of Japan

URL: http://jpsj.ipap.jp/link?JPSJ/81/023705/
DOI: 10.1143/JPSJ.81.023705
KEYWORDS:organic superconductor, crystal structure, charge order, two-dimensionality, magnetic torque


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