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Pressure Dependence of the Structural and Electronic Properties of Organic Superconductors

Published online by Cambridge University Press:  25 February 2011

D. Chasseau ,
J. Gaultier ,
H. Houbib ,
M. Rahal ,
L. Ducasse ,
M. Kurmoo  and
P. Day
D. Chasseau
Affiliation:
Laboratoire de Cristallographie et Physique Cristalline, URA 144 CNRS
J. Gaultier
Affiliation:
Laboratoire de Cristallographie et Physique Cristalline, URA 144 CNRS
H. Houbib
Affiliation:
Laboratoire de Cristallographie et Physique Cristalline, URA 144 CNRS
M. Rahal
Affiliation:
Laboratoire de Cristallographie et Physique Cristalline, URA 144 CNRS
L. Ducasse
Affiliation:
Laboratoire de Physico-Chimie Théorique, URA 503 CNRS Domaine Universitaire de Bordeaux I, 33405 - TALENCE Cédex, (FRANCE).
M. Kurmoo
Affiliation:
Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, OXFORD OX1 3QR (U. K.)
P. Day
Affiliation:
Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, OXFORD OX1 3QR (U. K.)
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Abstract

The pressure dependence (≤12 × 102 MPa) of the cell parameters of (TMTSF)2 - C104 and κ - (BEDT-TTF)2 - Cu(NCS)2 has been measured at room temperature. The magnitudes of the principal compressibilities calculated and the bulk modulus (B) do not vary all over the experimental pressure range for (TMTSF)2 - C104, while ki decrease slightly for κ - (ET)2 - Cu(NCS)2 and its Dulk modulus strongly increases. The directions of the principal compressibilities strongly varywith pressure for the former salt; in the latter case, the projections of the directions of the smallest and of the largest principal compressibilities remain parallel and perpendicular to the long molecular axis respectively whereas the intermediate is along the monoclinic b axis.

The crystal structures have been refined at 4 × 102 ,6 × 102 and 9.5 × 102 MPa (R = 0.05) for (TMTSF)2 - C104 and at 7 × 102 MPa (R = 0.095) for κ - (ET)2 - Cu(NCS)2. The transfer integrals have been calculated for the two compounds. In (TMTSF)2 - C104, both normal and transverse overlaps strongly increase with pressure; the dimerization is reduced under pressure and the two largest transverse interactions become identical. In κ - (ET)2 - Cu(NCS)2, the intra-dimer interaction strongly increases whereas the variations of the inter-dimer interactions may be very different.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 173: Symposium Q – Advanced Organic Solid State Materials , 1989 , 131
Copyright
Copyright © Materials Research Society 1990

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References

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