Atomic-scale mapping of superconductivity in the incoherent CDW mosaic phase of a transition metal dichalcogenide
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arXiv
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2024
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| author | Sajan, Sandra Guo, Haojie Agarwal, Tarushi Sánchez-Ramírez, Irián Patra, Chandan Vergniory, Maia G. de Juan, Fernando Singh, Ravi Prakash Ugeda, Miguel M. |
| author_facet | Sajan, Sandra Guo, Haojie Agarwal, Tarushi Sánchez-Ramírez, Irián Patra, Chandan Vergniory, Maia G. de Juan, Fernando Singh, Ravi Prakash Ugeda, Miguel M. |
| contents | The emergence of superconductivity in the octahedrally coordinated (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. Here, 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 unambiguous connection with the electronic structure of the mosaic phase. Spatially resolved conductance maps at the Fermi level at the onset of superconductivity reveal that the density of states is mostly localized on the CDW domains compared to the domain walls, which suggests their dominant role in the formation of superconductivity. This scenario is confirmed within the superconducting dome at 340 mK, where superconductivity is fully developed, and the subtle spatial inhomogeneity of the superconducting gap remains unlinked to the domain wall network. Our results provide key new insights into the fundamental interplay between superconductivity and CDW in these relevant strongly correlated systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_08200 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Atomic-scale mapping of superconductivity in the incoherent CDW mosaic phase of a transition metal dichalcogenide Sajan, Sandra Guo, Haojie Agarwal, Tarushi Sánchez-Ramírez, Irián Patra, Chandan Vergniory, Maia G. de Juan, Fernando Singh, Ravi Prakash Ugeda, Miguel M. Superconductivity Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons The emergence of superconductivity in the octahedrally coordinated (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. Here, 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 unambiguous connection with the electronic structure of the mosaic phase. Spatially resolved conductance maps at the Fermi level at the onset of superconductivity reveal that the density of states is mostly localized on the CDW domains compared to the domain walls, which suggests their dominant role in the formation of superconductivity. This scenario is confirmed within the superconducting dome at 340 mK, where superconductivity is fully developed, and the subtle spatial inhomogeneity of the superconducting gap remains unlinked to the domain wall network. Our results provide key new insights into the fundamental interplay between superconductivity and CDW in these relevant strongly correlated systems. |
| title | Atomic-scale mapping of superconductivity in the incoherent CDW mosaic phase of a transition metal dichalcogenide |
| topic | Superconductivity Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2411.08200 |