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Nodal superconductivity and superconducting domes in the topological Kagome metal CsV3Sb5

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arxiv 2102.08356 v2 pith:6ZKEJNCK submitted 2021-02-16 cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el

C. C. Zhao , L. S. Wang , W. Xia , Q. W. Yin , J. M. Ni , Y. Y. Huang , C. P. Tu , Z. C. Tao
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Z. J. Tu C. S. Gong H. C. Lei Y. F. Guo X. F. Yang S. Y. Li
This is my paper · ORCID
classification cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
keywords superconductivitydomekagomenodalsuperconductingcsv3sb5firstav3sb5
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Recently superconductivity was discovered in the Kagome metal AV3Sb5 (A = K, Rb, and Cs), which has an ideal Kagome lattice of vanadium. These V-based superconductors also host charge density wave (CDW) and topological nontrivial band structure. Here we report the ultralow-temperature thermal conductivity and high pressure resistance measurements on CsV3Sb5 with Tc = 2.5 K, the highest among AV3Sb5. A finite residual linear term of thermal conductivity at zero magnetic field and its rapid increase in fields suggest nodal superconductivity. By applying pressure, the Tc of CsV3Sb5 increases first, then decreases to lower than 0.3 K at 11.4 GPa, showing a clear first superconducting dome peaked around 0.8 GPa. Above 11.4 GPa, superconductivity re-emerges, suggesting a second superconducting dome. Both nodal superconductivity and superconducting domes point to unconventional superconductivity in this V-based superconductor. While our finding of nodal superconductivity puts a strong constrain on the pairing state of the first dome, which should be related to the CDW instability, the superconductivity of the second dome may present another exotic pairing state in this ideal Kagome lattice of vanadium.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Current-induced magnetoresistance hysteresis in the kagome superconductor CsV$_3$Sb$_5$

    cond-mat.supr-con 2025-01 conditional novelty 6.0 of 10

    Current-induced magnetoresistance hysteresis and a field-enhanced superconducting diode effect are observed in the kagome superconductor CsV3Sb5, pointing to chiral superconducting domains.

  2. Resistive anisotropy in the charge density wave phase of Kagome superconductor CsV3Sb5 thin films

    cond-mat.supr-con 2024-12 conditional novelty 6.0 of 10

    Thin-film CsV3Sb5 shows temperature- and field-dependent twofold resistive anisotropy consistent with electronic nematicity in the charge density wave state.

  3. Pairing correlation of the Kagome-lattice Hubbard model with the nearest-neighbor interaction

    cond-mat.str-el 2024-12 conditional novelty 5.0 of 10

    In the Kagome-lattice Hubbard model, on-site U favors next-nearest-neighbor d-wave pairing, and a nearest-neighbor interaction V=-1 switches the dominant channel to nearest-neighbor p-wave pairing.

  4. Ultralow-temperature heat transport evidence for residual density of states in the superconducting state of CsV3Sb5

    cond-mat.supr-con 2024-12 conditional novelty 5.0 of 10

    A finite residual heat-conduction term and non-zero zero-bias tunneling conductance show residual density of states in superconducting CsV3Sb5, absent when CDW order is suppressed by Ta doping.

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