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

Journal Article · · Communications Physics
 [1];  [1];  [2];  [1];  [1];  [1];  [3];  [3];  [4];  [5];  [5];  [6];  [2];  [1];  [1]
  1. Univ. of Tokyo, Kashiwa (Japan)
  2. Nagoya Univ. (Japan)
  3. CEA, DRF, IRAMIS, Palaiseau (France). Laboratoire des Solides Irradiés (LSI); Centre National de la Recherche Scientifique (CNRS), Palaiseau (France); Ecole Polytechnique, Palaiseau (France); Institut Polytechnique de Paris, Palaiseau (France)
  4. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  5. Univ. of California, Santa Barbara, CA (United States)
  6. Kyoto Univ. (Japan)
+ Show Author Affiliations
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.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Japan Society for the Promotion of Science (JSPS) KAKENHI; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2572982
Journal Information:
Communications Physics, Journal Name: Communications Physics Vol. 8; ISSN 2399-3650
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

Figures / Tables (4)

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Fig. 2(p. 3)figure Fig. 2
Fig. 3(p. 4)figure Fig. 3
Fig. 4(p. 5)figure Fig. 4

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY