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Study of the Solid State Properties of an Organic Superconductor

Published online by Cambridge University Press:  25 February 2011

Raul Fainchtein ,
S. T. D'arcangelo ,
S. S. Yangt  and
D. O. Cowant
Raul Fainchtein
Affiliation:
Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723–6099
S. T. D'arcangelo
Affiliation:
Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723–6099
S. S. Yangt
Affiliation:
Chemistry Dept., Johns Hopkins University, Baltimore, MD 21218
D. O. Cowant
Affiliation:
Chemistry Dept., Johns Hopkins University, Baltimore, MD 21218
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Abstract

We have synthesized cooper(I)di[bis(ethylenedithiolo)terathiafulvalene] bis(isothiocyanato), [(BEDT-TTF)2]+[Cu(NCS)2]using standard electrochemical methods. Single crystal samples of the compound were obtained and were found to have superconducting transition temperatures of 10.4 K, using DC conductivity measurements. [(BEDT-TTF)2+[Cu(NCS)2] shows a region between room temperature and 90 K which appears to be“semiconducting”

To characterize the structure of the samples we used Scanning Tunneling Microscopy (STM). STM supplied real-space images of the sample surface in accordance to its electronic structure. Ravy observed diffuse streaks between Bragg spots in his X-ray data of [(BEDT-TTF)2+[Cu(NCS)2]−, which he attributes to a stacking fault at every fourth repetition of the anion in the crystal structure [1]. STM shows no evidence for such disorder in [−(BEDT-TTF)2]+[Cu(NCS)2]−of the type proposed, and in fact illustrates direct evidence to the contrary. An intensity modulation in the STM data supports the possibility of a charge density wave commensurate with the lattice. This interpretation is consistent with the calculated Fermi surface which allows nesting of the wave vector and may explain the peculiar behavior of the temperature dependency of the conductivity data in the normal region.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 247: Symposium N – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1992 , 501
Copyright
Copyright © Materials Research Society 1992

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References

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