Enhanced Superconductivity near the Pressure-Tuned Quantum Critical Point of Charge-Density-Wave Order in Cu_1-δTe (δ = 0.016).

ABSTRACT: We have investigated the evolution of CDW states and structural phases in a Cu-deficient Cu_1-δTe (δ = 0.016) by employing high-pressure experiments and first-principles calculations. Raman scattering results reveal that the vulcanite structure at ambient pressure starts to change into the Cu-deficient rickardite (r-CuTe) structure from 6.7 GPa, which then becomes fully stabilized above 8.3 GPa. Resistivity data show that T_CDW1 (≈333 K) is systematically suppressed under high pressure, reaching zero at 5.9 GPa. In the pressure range of 5.2-8.2 GPa, a sharp resistivity drop due to superconductivity occurs at the onset temperature T_C = ~2.0-3.2 K. The maximum T_C = 3.2 K achieved at 5.6 GPa is clearly higher than that of C

SUBMITTER: Kim KT 

PROVIDER: S-EPMC12608423 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature