Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids

J. Phys. Colloques 46 (1985) C10-677-C10-680
DOI: 10.1051/jphyscol:198510149

DAMPING NEAR THE CDW PHASE TRANSITIONS IN 1T-TaS₂

A. SUZUKI¹, R. YAMAMOTO², M. DOYAMA², H. MIZUBAYASHI³ and S. OKUDA<sup>3

1</sup>  Department of Metallurgical Engineering, Faculty of Engineering Yokohama National University, Tokiwadai 156, Hodogaya-ku, Yokohama 240, Japan
²  Department of Metallurgy and Materials Science, Faculty of Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113, Japan
³  Institute of Materials Science, The University of Tsukuba, Tennodai 1-1-1-, Sakura-mura, Niihari-gun, Ibaraki 305, Japan

Abstract
The temperature dependence of the internal friction in 1T-TaS₂ was measured by the resonant flexural vibration technique over the temperature range between 170K and 270K. On cooling, one wide damping peak (at about 185K) was observed, whereas on heating, a less sharp maximum (at about 225K) appeared over the temperature ranges corresponding to the modulus anomalies. In comparing with the heat capacity measurement, it is suggested that the main damping peak in heating anomaly is preceded by a premonitory peak, which is due to the extrinsic internal strain, while the main broad peak can be interpreted as the result of the internal strain induced by the elastic domains through the change of the crystal symmetry.