Theory of Sound Wave and Phason in a Quasi-One-Dimensional Incommensurate CDW System.II.Acoustic Anomalies at T_c

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概要

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• Anomalies of the sound velocity and ultrasonic attenuation coefficient at an incom-mensurate CDW transition temperature (I.) are investigated in a quasi-one-dimen-sional system. A scaling relation between the anomaly above T. and that below T. isestablished. The temperature dependence of the arnomaly shows a cross-over fromone to three dimensions according to a change of the dimensionality of critical fluctua-lions. The accoustic anomalies are shown to be enhanced by breaking of the chargeconjugation symmetry resulting from the nonlinearity of the electron dispersion. As aresult, the sound velocity shows a dip which diverges as f.7.(r) for r>>r. and as (TNT.)/, 7z(r) for r $ r. where r= l (T. - 7') / T. l , /.(r) = r " and r. is a non-dimensional cross-over temperature. The ultrasonic attenuation coefficient diverges at T. as f,7.(r) forr>>r. and as (r/r.)f,7.(r) for r<,r.. For both anomalies, the scaling relation showsthat /.(r) above T. is transformed into 2/.(2r) below T..

• 1986-07-15

著者

• Nakane Yoshinori

  Institute Of Physics University Of Tsukuba

関連論文

• Impurity Pinning and Microwave Conductivity of Incommensurate Spin Density Waves
• Theory of Sound Wave and Phason in a Quasi-One-Dimensional Incommensurate CDW System.II.Acoustic Anomalies at T_c
• Microwave Conductivity of Incommensurate Charge Density Wave Systems
• Pinning Frequency in Incommensurate CDW Systems -The Ward Identity-
• Theory of Sound Wave and Phason in a Quasi One-Dimensional Incommensurate CDW System I. : Long-Range Coulnmb Effect

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