Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Superconductivity: Properties and Electronic Structure I
TT 5.2: Vortrag
Montag, 17. März 2025, 09:45–10:00, H36
Atomic-scale mapping of superconductivity in the incoherent CDW mosaic phase of a transition metal dichalcogenide — •Sandra Sajan1, Haojie Guo1, Tarushi Agarwal2, Irián S. Ramírez1, Chandan Patra2, Maia G. Vergniory1, Fernando de Juan1, Ravi P. Singh2, and Miguel M. Ugeda1 — 1Donostia International Physics Center, Paseo Manuel de Lardizábal 4, 20018 San Sebastián, Spain — 2Department of Physics, Indian Institute of Science Education and Research Bhopal, Bhopal 462066, India
The emergence of superconductivity in the 1T phase of TaS2 is preceded by the intriguing loss of long-range order in the charge density wave (CDW). Such decoherence, attainable by different methods, results in the formation of nm-sized coherent CDW domains bound by a two-dimensional network of domain walls (DW)-mosaic phase, which has been proposed as the spatial origin of the superconductivity. We report the atomic-scale characterization of the superconducting state of 1T-TaSSe, a model 1T compound exhibiting the CDW mosaic phase. We use high-resolution scanning tunneling spectroscopy and Andreev spectroscopy to probe the microscopic nature of the superconducting state in connection with the electronic structure of the DW network. Spatially resolved conductance maps at the Fermi level reveal a uniform landscape, independent of domain structure, indicating no link to superconductivity. This is confirmed at 340mK within the superconducting dome, where the gap’s subtle inhomogeneity remains unconnected to DWs providing new insights into the fundamental interplay between SC and CDW in these relevant strongly correlated systems.
Keywords: Transition metal dichalcogenide; Correlated materials; Superconductivity; Charge density wave; 1T-TaSSe