Type-II superconductivity in the Dirac semimetal PdTe2

Article Article scientifique Article Type-II superconductivity in the Dirac semimetal PdTe2 eng 2024-04-08 2024-04-08 author Gupta Ritu 984017 author Witteveen Catherine 0000-0003-0710-9298 986163 Département de physique de la matière quantique (FIMAC) author Das Debarchan author von Rohr Fabian 973176 Département de physique de la matière quantique (FIMAC) Fabian Oliver Von Rohr author Khasanov Rustem 134507 10.1103/PhysRevB.109.134507 2469-9950 https://link.aps.org/doi/10.1103/PhysRevB.109.134507 We report on the microscopic superconducting properties of the Dirac semimetal PdTe2. In this study, we have focused on mosaic crystals of PdTe2, and used detailed zero-field and transverse-field muon-spin relaxation/rotation (μSR), ac-magnetic susceptibility, and resistivity measurements to investigate their superconducting properties. The magnetic susceptibility measurements reveal two superconducting transition temperatures at 1.8 and 1.6 K, respectively, in agreement with earlier reports. In contrary to these reports, we find that these mosaic PdTe2 crystals are not type-I, but rather type-II superconductors. In fact, we observe the clear manifestation of a flux-line lattice through a clear diamagnetic shift and Gaussian broadening of the Fourier spectra in the superconducting state. This behavior is likely caused by the disorder in the mosaic crystals of PdTe2 studied here. Our analysis of the superconducting order parameter by the means of temperature-dependent magnetic penetration depth λ(T ) reveals a fully gapped superconducting state that can be well-fitted using an s-wave symmetric gap. We find that PdTe2 is a promising model system for the investigation and interplay of nontrivial topology, surface superconductivity, and type-II bulk superconductivity in a van der Waals material. Moreover, our results indicate that the superconductivity in this material can be easily modified from type-I to type-II by disorder in the system. Dewey 500.2 UK Research and Innovation Fault Current Calculations for Distribution Networks with Embedded Generation 200021 GB Innovate UK Swiss National Science Foundation Novel Magnetic and Topological 2D Materials (MAGICAL 2D) 204065 CH Projects 33 Département de physique de la matière quantique 131 false 1383 Groupe von Rohr Physical review. B 109 13 9fae5493-9039-4802-8454-e80999032486 Article (Published version) Public Article-scientifique-from-crossref.pdf 977636 application/pdf 28d9a19d4e1008ab3fd8120a14f1bfc34d5aa6955300db194d9086da59a1b50b openAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique

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Type-II superconductivity in the Dirac semimetal PdTe₂	Physical review. B			2024	212	969

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Gupta, Ritu