Infrared signature of the charge-density-wave gap in $ZrT{e}_3$

Abstract

The chain-like $ZrT{e}_3$ compound undergoes a charge-density-wave (CDW) transition at $T_{CDW}=63$ $K$, most strongly affecting the conductivity perpendicular to the chains. We measure the temperature ($T$) dependence of the optical reflectivity from the far infrared up to the ultraviolet with polarized light. The CDW gap $\Delta (T)$ along the direction perpendicular to the chains is compatible for $T<T_{CDW}$ with the behavior of an order parameter within the mean-field Bardeen-Cooper-Schrieffer (BCS) theory. $\Delta (T)$ also persists well above $T_{CDW}$, which emphasizes the role played by fluctuation effects.

References in corpus (1)

• Optical investigation of the charge-density-wave phase transitions in $NbS{e}_3$

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