Investigations of proximity-induced superconductivity in the topological insulator Bi2Te3 by microRaman spectroscopy
| Autor: | Jacek Szade, D. Kiphart, Piotr Kuświk, M. Wiesner, Y. Harkavyi, Stefan Jurga, Katarzyna Balin, Boguslaw Mroz |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Electronic properties and materials Science YBCO Article Superconducting properties and materials symbols.namesake HTSC Surfaces interfaces and thin films Nanoscience and technology Condensed Matter::Superconductivity Bi2Te3 Electronic devices Spectroscopy Topological matter Superconductivity Multidisciplinary Condensed matter physics Hybrid device Physics Charge (physics) Topological insulator symbols Medicine TI Pseudogap Raman spectroscopy |
| Zdroj: | Scientific Reports Scientific Reports, Vol 11, Iss 1, Pp 1-9 (2021) |
| ISSN: | 2045-2322 |
| Popis: | We used the topological insulator (TI) Bi2Te3 and a high-temperature superconductor (HTSC) hybrid device for investigations of proximity-induced superconductivity (PS) in the TI. Application of the superconductor YBa2Cu3O7-δ (YBCO) enabled us to access higher temperature and energy scales for this phenomenon. The HTSC in the hybrid device exhibits emergence of a pseudogap state for T > Tc that converts into a superconducting state with a reduced gap for T c. The conversion process has been reflected in Raman spectra collected from the TI. Complementary charge transport experiments revealed emergence of the proximity-induced superconducting gap in the TI and the reduced superconducting gap in the HTSC, but no signature of the pseudogap. This allowed us to conclude that Raman spectroscopy reveals formation of the pseudogap state but cannot distinguish the proximity-induced superconducting state in the TI from the superconducting state in the HTSC characterised by the reduced gap. Results of our experiments have shown that Raman spectroscopy is a complementary technique to classic charge transport experiments and is a powerful tool for investigation of the proximity-induced superconductivity in the Bi2Te3. |
| Databáze: | OpenAIRE |
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