Tc of 11K Identified for the Third Polymorph of the (BEDT-TTF)(BEDT-TTF){<_2}Ag(CF{<_3}){<_4}(TCE) Organic Superconductor.

Journal Article · Sun Jan 01 04:00:00 EST 2012 · Journal of the Physical Society of Japan

DOI:https://doi.org/10.1143/JPSJ.81.023705· OSTI ID:1041375

Kawamoto, T; Mori, T; Nakao, A; Murakami, Y; Schlueter, J A ^[1]

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1. Materials Science Division

The crystal structure of the third polymorph of the organic superconductor (BEDT-TTF){sub 2}Ag(CF{sub 3}){sub 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, {Kappa}- and {alpha}-types. Although this structure is similar to the previously solved two-layered high-T{sub c} phase of (BEDT-TTF){sub 2}Ag(CF{sub 3}){sub 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 {Kappa}-type conducting layer, because the {alpha}-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.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1041375
• Report Number(s): ANL/MSD/JA-71166
• Journal Information: Journal of the Physical Society of Japan, Journal Name: Journal of the Physical Society of Japan Journal Issue: 2 Vol. 81; ISSN JUPSAU; ISSN 0031-9015
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
BEDT-TTF
CRYSTAL STRUCTURE
ORGANIC SUPERCONDUCTORS
SUPERCONDUCTIVITY
TRANSITION TEMPERATURE