Hysteresis in thermal expansion of the quasi 1-dimensional conductor TaS$_3$: Coupling of the underlying and the electronic crystals

V.Ya. Pokrovskii; A.V. Golovnya; P.M. Shadrin

doi:doi:10.1051/jp4:20020417

Numéro		J. Phys. IV France Volume 12, Numéro 9, November 2002


Page(s)		287 - 287
DOI		https://doi.org/10.1051/jp4:20020417

J. Phys. IV France 12 (2002) Pr9-287
DOI: 10.1051/jp4:20020417

Hysteresis in thermal expansion of the quasi 1-dimensional conductor TaS ₃: Coupling of the underlying and the electronic crystals

V.Ya. Pokrovskii, A.V. Golovnya and P.M. Shadrin

Institute of Radioengineering and Electronics, Mokhovaya 11-7, K-9 GSP-9, Moscow 101999, Russia

Abstract
An interferometer-based setup for measurements of length of needle-like samples is developed, and thermal expansion of o-TaS ₃ crystals is studied. Below the Peierls transition the temperature hysteresis of length L is observed, the width of the hysteresis loop $\delta L/L$ being up to $5\times 10^{-5}$ . Curiously, L(T) changes so that it is in front of its equilibrium value. The hysteresis loop couples with that of conductivity. With lowering T the charge-density waves' (CDW) elastic modulus grows and at 100 K becomes comparable with that of the lattice Y_l. The results justify the assumption about the strain dependence of the CDW wave vector and clarify the nature of the anomalies of Y_l which occur on the CDW depinning. In particular, Y_l, is expected to show a strong drop in the static regime, if measured at sufficiently small sample elongation $(\delta L/L < 10^{ -5})$ .

Hysteresis in thermal expansion of the quasi 1-dimensional conductor TaS 3: Coupling of the underlying and the electronic crystals

Hysteresis in thermal expansion of the quasi 1-dimensional conductor TaS ₃: Coupling of the underlying and the electronic crystals