Pseudo-gap in tunneling spectra as a signature of inhomogeneous superconductivity in oxide interfaces
| Autor: | Bucheli, D., Caprara, S., Grilli, M. |
|---|---|
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Supercond. Sci. Technol. 28 (2015) 045004 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0953-2048/28/4/045004 |
| Popis: | We present a theory for the pseudo-gap state recently observed at the LaAlO3/SrTiO3 interface, based on superconducting islands embedded in a metallic background. Superconductivity within each island is BCS-like, and the local critical temperatures are randomly distributed, some of them necessarily exceeding the critical temperature for global percolation to the zero resistance state. Consequently, tunneling spectra display a suppression of the density of states and coherence peaks already well above the percolative transition. This model of inhomogeneous superconductivity accounts well for the experimental tunneling spectra. The temperature dependence of the spectra suggests that a sizable fraction of the metallic background becomes superconducting by proximity effect when the temperature is lowered. Comment: 5 pages with 4 figures and supplementary material with 7 pages with 6 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|