Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-01-03
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 figures. Phys. Rev. Lett., accepted for publication
Scientific paper
10.1103/PhysRevLett.88.246401
An original 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 $5 \cdot 10^{-5}$. The behavior of the loop is anomalous: the length changes so that it is in front of its equilibrium value. The hysteresis loop couples with that of conductivity. The sign and the value of the length hysteresis are consistent with the strain dependence of the charge-density waves (CDW) wave vector. With lowering temperature down to 100 K the CDW elastic modulus grows achieving a value comparable with the lattice Young modulus. Our results could be helpful in consideration of different systems with intrinsic superstructures.
Golovnya A. V.
Pokrovskii Ya. V.
Shadrin P. M.
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