The authors investigate the high-pressure phase boundaries of Pd-intercalated 2H-TaSe2 crystals at low temperatures. By systematically tuning the charge density wave (CDW) transition temperatures using hydrostatic pressure, they identify a quantum critical point near 21.5 GPa. At this critical pressure, both the superconducting transition temperature and the upper critical field reach their maximum values. Moreover, an effective electron mass in the Fermi liquids states is most enhanced at the quantum critical point, while Raman scattering confirms disappearance of periodic lattice distortions linked to the CDW. These findings highlight the crucial role of CDW quantum fluctuations in optimizing superconductivity.
- Yeahan Sur
- Dong-Hyeon Gim
- Kee Hoon Kim
