Scholarlink

<p>The presence of a quantum-critical point (QCP) at which a nearby ordered phase is suppressed to zero temperature is often invoked to explain emergent quantum phases, e.g. superconductivity. Yet, identifying a QCP and establishing its correlation with superconductivity remains challenging. Materials featuring charge-density-wave (CDW) order and superconductivity offer a clear scenario as both states can be associated with electron-phonon coupling. Here, we uncover a CDW-QCP and demonstrate its interrelation with superconductivity in the prototypical transition-metal dichalcogenide 2<i>H</i>-TaSe<sub>2</sub>. We determine the evolution of the CDW state up to and beyond its suppression at the critical pressure <i>p</i><sub>c</sub> = 19.9(1) GPa by means of X-ray diffraction and inelastic X-ray scattering measurements providing a full crystallographic refinement of the commensurate CDW superstructure. The pressure-induced CDW-QCP in close vicinity to the maximum superconducting transition temperature. Ab-initio lattice dynamical calculations corroborate that 2<i>H</i>-TaSe<sub>2</sub> features order-parameter fluctuation enhanced superconductivity and can serve as a paradigm to investigate superconductivity near a CDW-QCP.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Charge-density-wave quantum critical point under pressure in 2H-TaSe2

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年8月26日

查看全文
  • Yuliia Tymoshenko,
  • Amir-Abbas Haghighirad,
  • Rolf Heid,
  • Tom Lacmann,
  • Alsu Ivashko,
  • Adrian Merritt,
  • Xingchen Shen,
  • Michael Merz,
  • Gaston Garbarino,
  • Luigi Paolasini,
  • Alexei Bosak,
  • Florian K. Diekmann,
  • Kai Rossnagel,
  • Stephan Rosenkranz,
  • Ayman H. Said,
  • Frank Weber

摘要

The presence of a quantum-critical point (QCP) at which a nearby ordered phase is suppressed to zero temperature is often invoked to explain emergent quantum phases, e.g. superconductivity. Yet, identifying a QCP and establishing its correlation with superconductivity remains challenging. Materials featuring charge-density-wave (CDW) order and superconductivity offer a clear scenario as both states can be associated with electron-phonon coupling. Here, we uncover a CDW-QCP and demonstrate its interrelation with superconductivity in the prototypical transition-metal dichalcogenide 2H-TaSe2. We determine the evolution of the CDW state up to and beyond its suppression at the critical pressure pc = 19.9(1) GPa by means of X-ray diffraction and inelastic X-ray scattering measurements providing a full crystallographic refinement of the commensurate CDW superstructure. The pressure-induced CDW-QCP in close vicinity to the maximum superconducting transition temperature. Ab-initio lattice dynamical calculations corroborate that 2H-TaSe2 features order-parameter fluctuation enhanced superconductivity and can serve as a paradigm to investigate superconductivity near a CDW-QCP.