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This research demonstrates how tensile strain can tune the superconducting transition temperature of kagome metal CsV₃Sb₅ to 3.6 Kelvin while preserving its charge density wave order. By splitting degenerate superconducting states, the study offers a new pathway for manipulating unconventional superconductivity near quantum critical points without relying on external pressure alone. Such tunability is a fundamental step toward engineering materials with higher-temperature superconducting properties for future quantum applications.

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Stretching this metal boosts superconductivity to 3.6 Kelvin

Quantum ZeitgeistSeptember 1, 20266 min read

Tensile strain applied to kagome metal CsV₃Sb₅ boosts its superconducting transition temperature to 3.6 Kelvin, while leaving charge density wave order intact.

Researchers at Okayama University and collaborating institutions have boosted superconductivity in the kagome metal CsV₃Sb₅ to approximately 2.5 Kelvin through the application of tensile strain. This work demonstrates a path toward tuning superconductivity independently of charge density wave order within the material, a long-standing challenge in the field. The team synthesized high-quality single crystals of CsV₃Sb₅, essential for accurate measurements of the material's response to strain. At a tensile strain of ε = +0.90%, the ¹²¹Sb-NQR data revealed a double transition: an upper transition at 3.6 Kelvin to a nodal gap state, and a lower one at 3.0 Kelvin characterized by a nodeless gap. These results suggest degenerate…

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