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<p>Superconductivity in TiSe<sub>2</sub> emerges when the charge density wave (CDW) order is suppressed under pressure or doping. Recent theoretical and experimental studies suggest that a Lifshitz transition plays a key role in stabilizing the superconducting phase. Here, we present muon spin resonance measurements of pressurized TiSe<sub>2</sub>, revealing a two-gap superconducting state. Our results indicate that the smaller gap contributes unexpectedly strongly to the total superfluid density. This effect is consistent with an enhanced density of states in a newly formed Fermi surface pocket at the Lifshitz transition. These findings provide microscopic insight into the interplay between CDW suppression, Fermi surface reconstruction, and multi-gap superconductivity in TiSe<sub>2</sub>, demonstrating how pressure-induced changes in electronic structure can shape superconducting properties in layered materials.</p>

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Lifshitz-enhanced superfluid density in two-gap superconducting TiSe2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月15日

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  • F. Elson,
  • J. Philippe,
  • G. Simutis,
  • O. K. Forslund,
  • M. Abdel-Hafiez,
  • M. Janoschek,
  • R. Khasanov,
  • D. Das,
  • J. Weissenrieder,
  • D. W. Tam,
  • Y. Sassa,
  • M. Månsson

摘要

Superconductivity in TiSe2 emerges when the charge density wave (CDW) order is suppressed under pressure or doping. Recent theoretical and experimental studies suggest that a Lifshitz transition plays a key role in stabilizing the superconducting phase. Here, we present muon spin resonance measurements of pressurized TiSe2, revealing a two-gap superconducting state. Our results indicate that the smaller gap contributes unexpectedly strongly to the total superfluid density. This effect is consistent with an enhanced density of states in a newly formed Fermi surface pocket at the Lifshitz transition. These findings provide microscopic insight into the interplay between CDW suppression, Fermi surface reconstruction, and multi-gap superconductivity in TiSe2, demonstrating how pressure-induced changes in electronic structure can shape superconducting properties in layered materials.