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

Shahar Simon, Hennadii Yerzhakov, Sajilesh K. P., Atzmon Vakahi, Sergei Remennik, Jonathan Ruhman, Maxim Khodas, Oded Millo and Hadar Steinberg ()
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Shahar Simon: The Hebrew University of Jerusalem
Hennadii Yerzhakov: Bar Ilan University
Sajilesh K. P.: Technion – Israel Institute of Technology
Atzmon Vakahi: The Hebrew University of Jerusalem
Sergei Remennik: The Hebrew University of Jerusalem
Jonathan Ruhman: Bar Ilan University
Maxim Khodas: The Hebrew University of Jerusalem
Oded Millo: The Hebrew University of Jerusalem
Hadar Steinberg: The Hebrew University of Jerusalem

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract In metallic transition metal dichalcogenides (TMDs), which remain superconducting down to single-layer thickness, the critical temperature Tc 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 TaS2 heterostructures. The upper critical field Hc2 is strongly enhanced towards the single-layer limit – following $${H}_{c2}\propto {T}_{c}^{2}$$ 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 Hc2. Using Gor’kov’s theory, we calculate the suppression of Tc by the competing charge density wave (CDW) order, which affects the quasiparticle density of states and the resulting Tc and Hc2. The latter is found to be universally enhanced by two orders of magnitude. Our results substantiate CDW as the key determinant factor limiting Tc across the TMD family.

Date: 2024
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DOI: 10.1038/s41467-024-54517-2

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