Tunneling Spectroscopy ofc-AxisY1−xCaxBa2Cu3O7−δThin-Film Superconductors
| Autor: | J. Y. T. Wei, W. A. Atkinson, J. H. Ngai |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Physics
Superconductivity Doping Scanning tunneling spectroscopy General Physics and Astronomy Spin polarized scanning tunneling microscopy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Spectral line Crystallography Condensed Matter::Superconductivity Pairing 0103 physical sciences 010306 general physics 0210 nano-technology Spectroscopy Energy (signal processing) |
| Zdroj: | Physical Review Letters. 98 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.98.177003 |
| Popis: | Scanning tunneling spectroscopy was performed on $c$-axis ${\mathrm{Y}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ thin films for $x=0$, 0.05, 0.15, and 0.20 at 4.2 K. The measured spectra show main-gap, subgap, and satellite features which scale similarly in energy versus Ca doping, suggesting that they are associated with a single pairing energy. The data are analyzed with a multiband tunneling model which attributes the subgap features to the chain band and the satellite and main-gap features to the plane band for ${d}_{{x}^{2}\ensuremath{-}{y}^{2}}+s$ pairing symmetry. These results suggest that the superconductivity in ${\mathrm{Y}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ involves multiple bands. |
| Databáze: | OpenAIRE |
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