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<p>Kagome metals <i>A</i>V<sub>3</sub>Sb<sub>5</sub> (<i>A</i>&#xa0;= K, Rb, Cs) provide a compelling platform to explore the interplay between superconductivity (SC) and charge-density-wave (CDW) orders. While distinct CDW orders have been identified in K/RbV<sub>3</sub>Sb<sub>5</sub> versus CsV<sub>3</sub>Sb<sub>5</sub>, their influence on the SC order parameter remains unresolved. Here, we investigate low-energy quasiparticle excitations in <i>A</i>V<sub>3</sub>Sb<sub>5</sub>, uncovering a striking difference in SC gap anisotropy: K/RbV<sub>3</sub>Sb<sub>5</sub> exhibit fully gapped, nearly isotropic <i>s</i>-wave states, in contrast to the strongly anisotropic SC gap in CsV<sub>3</sub>Sb<sub>5</sub>. Impurity scattering introduced via electron irradiation in K/RbV<sub>3</sub>Sb<sub>5</sub> has a minimal impact on low-energy excitations, and it induces an increase in the SC transition temperature <i>T</i><sub>c</sub>, consistent with more isotropic <i>s</i>-wave SC competing with CDW order. Our theoretical analysis attributes the observed SC gap anisotropy differences to distinct CDW modulation patterns: the star-of-David structure unique to CsV<sub>3</sub>Sb<sub>5</sub> preserves van Hove singularities near the Fermi level, promoting anisotropic <i>s</i>-wave SC with enhanced <i>T</i><sub>c</sub> via bond-order fluctuations. These findings establish a systematic framework for understanding the interplay between SC and CDW orders in <i>A</i>V<sub>3</sub>Sb<sub>5</sub>, driven by electron correlations.</p>

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Impact of charge-density-wave pattern on the superconducting gap in Vanadium-based kagome superconductors

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月18日

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  • Takuya Nagashima,
  • Kota Ishihara,
  • Youichi Yamakawa,
  • Fan Chen,
  • Kumpei Imamura,
  • Masaki Roppongi,
  • Romain Grasset,
  • Marcin Konczykowski,
  • Brenden R. Ortiz,
  • Andrea Capa Salinas,
  • Stephen D. Wilson,
  • Rina Tazai,
  • Hiroshi Kontani,
  • Kenichiro Hashimoto,
  • Takasada Shibauchi

摘要

Kagome metals AV3Sb5 (A = K, Rb, Cs) provide a compelling platform to explore the interplay between superconductivity (SC) and charge-density-wave (CDW) orders. While distinct CDW orders have been identified in K/RbV3Sb5 versus CsV3Sb5, their influence on the SC order parameter remains unresolved. Here, we investigate low-energy quasiparticle excitations in AV3Sb5, uncovering a striking difference in SC gap anisotropy: K/RbV3Sb5 exhibit fully gapped, nearly isotropic s-wave states, in contrast to the strongly anisotropic SC gap in CsV3Sb5. Impurity scattering introduced via electron irradiation in K/RbV3Sb5 has a minimal impact on low-energy excitations, and it induces an increase in the SC transition temperature Tc, consistent with more isotropic s-wave SC competing with CDW order. Our theoretical analysis attributes the observed SC gap anisotropy differences to distinct CDW modulation patterns: the star-of-David structure unique to CsV3Sb5 preserves van Hove singularities near the Fermi level, promoting anisotropic s-wave SC with enhanced Tc via bond-order fluctuations. These findings establish a systematic framework for understanding the interplay between SC and CDW orders in AV3Sb5, driven by electron correlations.