Upper critical field behavior of the kagome superconductor CsV3Sb5 driven by van Hove singularities
Ramakanta Chapai, A. E. Koshelev, M. P. Smylie, D. Y. Chung, Asghar Kayani, Khushi Bhatt, Gaurab Rimal, M. G. Kanatzidis, W.-K. Kwok, J. F. Mitchell, Ulrich Welp
DOI 10.1103/s2s9-f7tx · Physical Review B
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Abstract
van Hove singularities (VHS) located close to the Fermi level in kagome superconductors AV3Sb5 (A=K, Rb, Cs) have a profound influence on their electronic and transport characteristics. Specifically, magnetotransport and susceptibility measurements on CsV3Sb5 reveal an anomalous temperature dependence of the upper critical field Hc2(T), characterized by a pronounced upward curvature for both in-plane and c axis magnetic fields, with zero-temperature Hc2 values of ∼6.0 T and ∼1.2 T, respectively. Our theoretical analysis, using a newly developed single-band model incorporating VHS and gap anisotropy, suggests that the observed upper critical field behavior is predominantly driven by the anisotropy of the Fermi velocity originating from VHS, instead of multiband effects or gap anisotropy. Increased electron scattering introduced by proton-irradiation defects smears out the VHS, reduces anisotropy, and recovers the conventional Hc2(T) behavior, corroborating our proposed model.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CsV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | Pressure not reported | midpoint |
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