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TT: Fachverband Tiefe Temperaturen
TT 93: Superconductivity – Poster II
TT 93.3: Poster
Donnerstag, 12. März 2026, 18:00–20:00, P4
Superconductivity, CDW, and quasiparticle interaction in 2H-TaS2 probed by point contacts — •Oksana Kvitnitskaya1,2, Yurii Naidyuk2, and Bernd Büchner1 — 1Leibniz-Institute for Solid State Research, IFW Dresden, Dresden, Germany — 2B. Verkin Institute for Low Temperature Physics and Engineering NAS of Ukraine, Kharkiv, Ukraine
Among Ta-based dichalcogenides, metallic 2H-TaS2 exhibits physical properties that depend on its lattice perfection, vacancies, intercalation, and external pressure, etc. TaS2 represents a classic example of a material in which charge density wave (CDW) order and superconductivity coexist and compete. Point contacts (PCs) propose a direct method for measuring electron-quasiparticle interaction by Yanson PC spectroscopy and superconducting gap via Andreev reflection. Also the phase transitions that affect electron transport can be detected using PC as a probe. In this report, we demonstrate the first PC study of 2H-TaS2. Firstly, we observed enhanced Tc in produced PCs, which can reach up to 7 K, instead of 1 K in the bulk, and the critical magnetic field reaches up to 5T at 2K. The nonlinear current-voltage characteristics I(V) of PC also demonstrate features associated with the CDW transition, which is evident in dV/dI as dips symmetrically placed with respect to zero-bias voltage. Still, electron-phonon interaction features are not resolved undoubtedly in PC spectra, instead quadratic dependence of dV/dI(V) points out that the electron-electron interaction can be dominant at low biases. These preliminary results are very intriguing and give impetus to their deeper investigation.
Keywords: transition metals dichalcogenides; point contacts; enhanced superconductivity; charge density waves