Quantum critical point and superconducting dome in the pressure phase diagram of o-TaS3

Abstract

We measure the electrical resistance of o-TaS3 between 1K and 300K under pressures up to 20GPa. We observe a gradual decrease of the charge density wave transition temperature with increasing pressure P following a mean-field quantum fluctuation power law with a quantum critical point at a pressure Pc = 11.5GPa. Around the quantum critical point we observe a superconducting dome with a maximum superconducting transition temperature Tc = 3.1K. Such dome is similar to superconducting domes around other types of order suggesting that the QCP is directly responsible for the enhancement of superconductivity through a universal mechanism still not well understood.

To be published in PRB as a Rapid Communication. 11 pages with 4 figures

References in corpus (3)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Quantum criticality
• Electronic crystals: an experimental overview

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