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Superconductivity evolves as functions of pressure or doping fromcharge-ordered phases in a variety of strongly correlated systems, suggestingthat there may be universal characteristics associated with the competitionbetween superconductivity and charge order in these materials. We present aninelastic light (Raman) scattering study of the structural changes that precedethe pressure-tuned charge-density-wave (CDW) to superconductor transition inone such system, ZrTe3. In certain phonon bands, we observe dramatic linewidthreductions that accompany CDW formation, indicating that these phonons couplestrongly to the electronic degrees of freedom associated with the CDW. The samephonon bands, which represent internal vibrations of ZrTe3 prismatic chains,are suppressed at pressures above ~10 kbar, indicating a loss of long-rangeorder within the chains, specifically amongst intrachain Zr-Te bonds. Theseresults suggest a distinct structural mechanism for the observedpressure-induced suppression of CDW formation and provide insights into theorigin of pressure-induced superconductivity in ZrTe3.

Structural contributions to the pressure-tuned charge-density-wave to superconductor transition in ZrTe3: Raman scattering studies