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Sound Velocity Measurements in (Tmttf)2X Salts, X = ReO4, AsF6, SbF6

Published online by Cambridge University Press:  25 February 2011

S. E. Brown ,
H. H. S. Javadi  and
R. Laversanne
S. E. Brown
Affiliation:
Los Alamos National Laboratory, Los Alamos, N.M. 87545
H. H. S. Javadi
Affiliation:
Los Alamos National Laboratory, Los Alamos, N.M. 87545
R. Laversanne
Affiliation:
Centre de Recherche Paul Pascal, CNRS, Domaine Universitaire de bordeaux I, 33405 Talence Cedex, France
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Abstract

Young’s modulus E measurements using the vibrating reed technique are reported for salts of the (TMTTF)2X series, where X = ReO4, SbF6, AsF6. All three exhibit softening of the modulus at the structureless transition, with the largest effect in the material with the non–centrosymmetric anion ReO4. The behavior is typical of quadratic coupling to an order parameter plus effects from fluctuations. There is a large stiffening of E below the anion ordering temperature of (TMTTF)2ReO4.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 173: Symposium Q – Advanced Organic Solid State Materials , 1989 , 245
Copyright
Copyright © Materials Research Society 1990

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