Properties of strained TaS 3 samples in the state of charge density wave and in the normal state
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C PROPERTIES OF SOLID
Properties of Strained TaS3 Samples in the State of Charge Density Wave and in the Normal State S. G. Zybtseva, V. Ya. Pokrovskiia*, O. M. Zhigalinab, D. N. Khmeleninb, D. Starešinićc, S. Šturmd, and E. Tchernychovad a Kotel’nikov
Institute of Radio Engineering and Electronics, Russian Academy of Sciences, ul. Mokhovaya 11-7, Moscow, 125009 Russia b Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333 Russia c Institute of Physics, Bijenička Cesta 46, P.O.B. 304, HR-10001, Zagreb, Croatia d National Institute of Chemistry, Jamova 39, SI-1000, Ljubljana, Slovenia *e-mail: [email protected]; [email protected] Received November 3, 2016
Abstract—The uniaxial strain of quasi-one-dimensional conductor whiskers of orthorhombic TaS3 at a strain higher than εc ~ 0.8% leads to a sharp increase in the coherence of the properties of a charge density wave (CDW), which manifests itself in its motion in fields higher than threshold field Et. During uniaxial elongation, TaS3 is shown to exhibit the following unusual properties even in weak fields: Peierls transition temperature TP depends nonmonotonically on ε, one-dimensional fluctuations weaken near TP, and the coherence length of a charge density increases at T < TP. Investigations in fields higher than Et show that the ultracoherent properties of CDW exist in a wide temperature range and are retained when temperature increases up to TP. These properties of CDW make it possible to observe a sharp increase in Et near TP and an almost jumplike increase in Et at T < 90 K. The increase in Et at TP is explained by a decrease in the coherence volume of CDW because of a fluctuational suppression of the Peierls gap. DOI: 10.1134/S1063776117030189
1. INTRODUCTION Quasi-one-dimensional conductors with a charge density wave (CDW) exhibit a number of effects related to their specific mechanical and elastic properties [1, 2]. The effect of deformation of samples on their transport properties [3–5] and Young’s modulus [6], a change in the elastic moduli in an electric field higher than a threshold field Et for sliding CDW [7– 14], anomalous of the elastic properties at high frequencies [15], and a change in the sample size and shape in an electric field [16–18] were detected. On a phenomenological level, these effects are explained by the mutual influence of CDW and crystal lattice strains. To understand this interaction, it is necessary to know how CDW changes during crystal deformation. The orthorhombic TaS3 compound (hereafter, simply TaS3) is a typical quasi-one-dimensional conductor with CDW. A single Peierls transition in this compound occurs at a temperature TP = 220 K. The mechanical properties of TaS3 have been studied in detail. The investigation of the action of uniaxial strain of TaS3 whiskers on the properties of CDW was started in the first half of the 1980s [3]. Nonmonotonic
behavior of linear and, then, nonlinear [4] conductivity as
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