Energy relaxation in disordered
charge and spin density waves |
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Authors: | Email author" target="_blank">R?MélinEmail author K?Biljakovi? J C?Lasjaunias |
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Institution: | (1) Centre de Recherches sur les Très Basses Températures (CRTBT) (U.P.R. 5001 du CNRS, Laboratoire conventionné avec l Université Joseph Fourier), B.P. 166, 38042 Grenoble Cedex 9, France;(2) Institute of Physics, P.O. Box 304, 10 001 Zagreb, Croatia |
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Abstract: | We investigate collective effects
in the strong pinning model of disordered charge
and spin density waves (CDWs and SDWs) in connection with heat relaxation
experiments.
We discuss the classical and quantum limits that
contribute to two distinct contribution to the specific heat (a Cv
T-2 contribution and a Cv T contribution respectively),
with two different types of disorder (strong pinning versus
substitutional impurities).
From the calculation of the two level system energy splitting distribution
in the classical limit
we find no slow relaxation
in the commensurate case and a broad spectrum of relaxation times
in the incommensurate case. In the commensurate case quantum effects
restore a non vanishing energy relaxation, and
generate stronger disorder
effects in incommensurate systems.
For substitutional disorder we obtain
Friedel oscillations
of bound states close to the Fermi energy.
With negligible interchain couplings
this explains the power-law specific heat Cv T
observed in experiments on CDWs and SDWs
combined to the power-law susceptibility
(T) T-1+ observed in the CDW o-TaS3. |
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Keywords: | |
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