Abstract
We have measured the effect of elastic, uniaxial stress on the resistance R, the thermoelectric power (TEP), and the superconducting transition temperature ${T}_{c}$ of ${\mathrm{TaSe}}_{3}$. We find that there is a nearly discontinuous change in R and in the TEP at a stress \ensuremath{\sigma} of about 1.2 GPa at 20 K. In this change R increases by several orders of magnitude, while the TEP changes sign and increases by several orders of magnitude. At higher temperatures this change becomes less pronounced and occurs over a larger range of \ensuremath{\sigma}. We suggest that this change is due to a Fermi-surface topology change, a structural phase transition, or a charge-density-wave transition. We found no evidence for a metal-to-nonmetal transition just above the normal-superconducting transition at ${T}_{c}$.
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