Strain-Tuned Nodal Superconductivity in the Charge-Ordered Kagome Metal CsV3Sb5
Abstract
The nature of the superconducting pairing symmetry in the kagome metal CsV3Sb5 and its relationship with the charge density wave (CDW) order are central unresolved issues. Here, we investigate the evolution of superconductivity in CsV3Sb5 under in-situ uniaxial pressure using 121Sb nuclear quadrupole resonance (NQR). We find that tensile strain significantly enhances the superconducting transition temperature, Tc, while the CDW remains unchanged, demonstrating that superconductivity can be tuned independently of the bulk charge order. At a tensile strain of ε = +0.90%, the nuclear spin-lattice relaxation rate reveals a remarkable double transition: an upper transition at Tc1 = 3.6 K to a nodal gap state, and a lower one at Tc2 = 3.0 K characterized by a nodeless gap. These results evidence degenerate superconducting states with different gap symmetry in the kagome metal at ambient pressure which split under strain. Our work demonstrates a high tunability of superconductivity by uniaxial pressure.
Versions
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BibTeX
@misc{takeuchi2026straintuned,
title = {{Strain-Tuned Nodal Superconductivity in the Charge-Ordered Kagome Metal CsV$_3$Sb$_5$}},
author = {Yusuke Takeuchi and Akito Kobayashi and Saki Uchida and Takumi Nagao and Seigo Ogawa and Rui Zhou and Shinji Kawasaki and Fei Song and Hao Ni and Yong Zhao and Guo-qing Zheng},
howpublished = {arXiv},
year = {2026},
month = jul,
doi = {10.48550/arxiv.2607.11115},
eprint = {2607.11115},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.11115},
}
RIS
TY - UNPB
TI - Strain-Tuned Nodal Superconductivity in the Charge-Ordered Kagome Metal CsV_3Sb_5
AU - Yusuke Takeuchi
AU - Akito Kobayashi
AU - Saki Uchida
AU - Takumi Nagao
AU - Seigo Ogawa
AU - Rui Zhou
AU - Shinji Kawasaki
AU - Fei Song
AU - Hao Ni
AU - Yong Zhao
AU - Guo-qing Zheng
PY - 2026
DA - 2026/07/13
PB - arXiv
DO - 10.48550/arxiv.2607.11115
UR - https://arxiv.org/abs/2607.11115
AB - The nature of the superconducting pairing symmetry in the kagome metal CsV_3Sb_5 and its relationship with the charge density wave (CDW) order are central unresolved issues. Here, we investigate the evolution of superconductivity in CsV_3Sb_5 under in-situ uniaxial pressure using ^121Sb nuclear quadrupole resonance (NQR). We find that tensile strain significantly enhances the superconducting transition temperature, T_c, while the CDW remains unchanged, demonstrating that superconductivity can be tuned independently of the bulk charge order. At a tensile strain of ε = +0.90%, the nuclear spin-lattice relaxation rate reveals a remarkable double transition: an upper transition at T_c1 = 3.6 K to a nodal gap state, and a lower one at T_c2 = 3.0 K characterized by a nodeless gap. These results evidence degenerate superconducting states with different gap symmetry in the kagome metal at ambient pressure which split under strain. Our work demonstrates a high tunability of superconductivity by uniaxial pressure.
ER -