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<p>Interplay between charge density wave (CDW) order and superconductivity (SC) in quasi-two-dimensional materials remains poorly understood due to their diverse experimental varieties. Here, we investigate the pressure-dependent electrical transport and Raman scattering spectra of 2<i>H</i>-Pd<sub>0.05</sub>TaSe<sub>2</sub>, which exhibits a CDW transition at <i>T</i><sub>CDW</sub> = 115 K and a superconducting transition at <i>T</i><sub>c</sub> = 2.6 K at ambient pressure conditions. As pressure increases, <i>T</i><sub>CDW</sub>, identified by the resistivity anomaly, shifts towards lower temperatures and approaches zero at a critical pressure of <i>P</i><sub>c</sub> ~ 21.5 GPa. At this critical pressure, both <i>T</i><sub>c</sub> and upper critical field <i>H</i><sub>c2</sub> reach their maximum values of ~ 8.5 K and ~ 6.4 T, respectively. Analysis of the Raman scattering spectra demonstrates that increasing pressure systematically suppresses both the two-phonon spectral weight above <i>T</i><sub>CDW</sub> and the CDW amplitudon energies below <i>T</i><sub>CDW,</sub> leading to their simultaneous disappearance at <i>P</i><sub>c</sub>. These observations provide direct evidence for the formation of a CDW quantum critical point (QCP) at <i>P</i><sub>c</sub>, indicating that charge and lattice fluctuations associated with the QCP of strongly coupled CDW order may enhance SC in pressurized 2<i>H</i>-Pd<sub>0.05</sub>TaSe<sub>2</sub>.</p>

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Enhanced superconductivity near a pressure-induced quantum critical point of strongly coupled charge density wave order in 2H-Pd0.05TaSe2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月28日

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  • Yeahan Sur,
  • Dong-Hyeon Gim,
  • Dilip Bhoi,
  • Dong Hyun Jang,
  • Keizo Murata,
  • Jia-Wei Hu,
  • Kai Zhang,
  • Zi-Yu Cao,
  • Viktor V. Struzhkin,
  • Xiao-Jia Chen,
  • Kee Hoon Kim

摘要

Interplay between charge density wave (CDW) order and superconductivity (SC) in quasi-two-dimensional materials remains poorly understood due to their diverse experimental varieties. Here, we investigate the pressure-dependent electrical transport and Raman scattering spectra of 2H-Pd0.05TaSe2, which exhibits a CDW transition at TCDW = 115 K and a superconducting transition at Tc = 2.6 K at ambient pressure conditions. As pressure increases, TCDW, identified by the resistivity anomaly, shifts towards lower temperatures and approaches zero at a critical pressure of Pc ~ 21.5 GPa. At this critical pressure, both Tc and upper critical field Hc2 reach their maximum values of ~ 8.5 K and ~ 6.4 T, respectively. Analysis of the Raman scattering spectra demonstrates that increasing pressure systematically suppresses both the two-phonon spectral weight above TCDW and the CDW amplitudon energies below TCDW, leading to their simultaneous disappearance at Pc. These observations provide direct evidence for the formation of a CDW quantum critical point (QCP) at Pc, indicating that charge and lattice fluctuations associated with the QCP of strongly coupled CDW order may enhance SC in pressurized 2H-Pd0.05TaSe2.