The transition-metal-dichalcogenide family as a superconductor tuned by charge density wave strength.

Autor: Simon S; The Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem, Israel.; The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, Israel., Yerzhakov H; Department of Physics, Bar Ilan University, Ramat Gan, Israel., K P S; Department of Physics, Technion - Israel Institute of Technology, Haifa, Israel., Vakahi A; The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, Israel., Remennik S; The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, Israel., Ruhman J; Department of Physics, Bar Ilan University, Ramat Gan, Israel., Khodas M; The Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem, Israel., Millo O; The Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem, Israel.; The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, Israel., Steinberg H; The Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem, Israel. hadar@phys.huji.ac.il.; The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, Israel. hadar@phys.huji.ac.il.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Nov 30; Vol. 15 (1), pp. 10439. Date of Electronic Publication: 2024 Nov 30.
DOI: 10.1038/s41467-024-54517-2
Abstrakt: In metallic transition metal dichalcogenides (TMDs), which remain superconducting down to single-layer thickness, the critical temperature T c decreases for Nb-based, and increases for Ta-based materials. This contradicting trend is puzzling, impeding the development of a unified theory. Here we study the thickness-evolution of superconducting tunneling spectra in TaS 2  heterostructures. The upper critical field H c2 is strongly enhanced towards the single-layer limit - following H c 2 ∝ T c 2 . The same ratio holds for the entire family of intrinsically metallic 2H-TMDs, covering 4 orders of magnitude in H c2 . Using Gor'kov's theory, we calculate the suppression of T c by the competing charge density wave (CDW) order, which affects the quasiparticle density of states and the resulting T c and H c2 . The latter is found to be universally enhanced by two orders of magnitude. Our results substantiate CDW as the key determinant factor limiting T c across the TMD family.
Competing Interests: Competing interests: The authors declare no competing interests.
(© 2024. The Author(s).)
Databáze: MEDLINE
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