Design and synthesis of organic superconductors (FY92 URI/RIP). Annual report, 1 October 1992-30 September 1993

Technical Report · Fri Oct 29 04:00:00 EDT 1993

OSTI ID:6960000

Montgomery, L K

A number of mixed-valence (2:1), conducting salts of bis(ethylenedithio)tetraselena-fulvalene (BETS) have been prepared. Four (GaCl(4), SbF(6), CF(3)SO(3) and CuN(CN)(2)Br) have been characterized in detail (X-ray crystallography, DC resistivity from 300-1 OK, rf penetration depth measurements (0.5K), pressure studies from 0.5-5 kbar at 4K, and tight-binding band calculations). The salts are highly metallic to low temperatures but do not exhibit superconductivity under the experimental conditions explored. The synthesis of a new synthetic metal precursor, bis(ethylenedithio)tetrathionaphthalene (BEDT-TTN), is about three-quarters completed. Spin density wave (SDW) and charge density wave (CDW) phenomena of three organic superconductors (k-(BEDT-TTF)CuN(CN)(2)Cl, (TMTSF)2PF6, and (TMTSF)(2)ReO(4), where BEDTTTF is bis(ethylenedithio)tetrathiafulvalene and TMTSF is tetramethyltetraselenafulvalene) have been studied in collaboration with Professor J.W. Brill (Department of Physics, University of Kentucky). The three organic metals avert the SDW and CDW transitions under pressure and become superconductors.

• Research Organization: Indiana Univ., Bloomington, IN (United States). Dept. of Chemistry
• OSTI ID: 6960000
• Report Number(s): AD-A-281308/7/XAB; CNN: F49620-92-J-0534
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
BEDT-TTF
CHEMICAL PREPARATION
DESIGN
DOCUMENT TYPES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HETEROCYCLIC COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
ORGANIC SUPERCONDUCTORS
PHYSICAL PROPERTIES
PROGRESS REPORT
SALTS
SELENIUM COMPOUNDS
SUPERCONDUCTORS
SYNTHESIS
TMTSF