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We have investigated the effect of 2.6-GeV U irradiation on the superconductivity of CsV₃Sb₅ and Cs(V0.93Nb0.07)₃Sb₅ single crystals by using resistivity and magnetization measurements. The critical transition temperature for CsV₃Sb₅ crystal is enhanced up to 4.3 K after irradiation with a dose of B_Φ=2.00.28em0exT, while the critical current density is increased up to ~0.8×10⁴0.28em0exA/cm² after irradiation with a dose of B_Φ=0.50.28em0exT under self-field at 2.0 K, which is about four times larger than that for the pristine crystal under the same condition. For Cs(V0.93Nb0.07)₃Sb₅ crystal, the critical transition temperature remains almost constant up to B_Φ=2.00.28em0exT, followed by monotonic suppression with further increase of dose. Besides the enhanced critical current density, we observe an anomalous peak effect in the magnetic hysteresis loop close to zero field at low irradiation doses, which can be interpreted by the matching effect in irradiated Cs(V0.93Nb0.07)₃Sb₅ crystals.
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Wang et al. (2024) studied this question.
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