Revisiting the vortex-core tunnelling spectroscopy in YBa$_2$Cu$_3$O$_{7-\delta}$
| Autor: | Jens Erik bruer, Andreas Erb, Christoph Renner, Oystein Fischer, Nathan Jenkins, Christophe Berthod, Zoran Ristić, Ivan Maggio-Aprile |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Abrikosov vortex
Science Phase (waves) General Physics and Astronomy Nanotechnology 02 engineering and technology ddc:500.2 01 natural sciences General Biochemistry Genetics and Molecular Biology Article Condensed Matter - Strongly Correlated Electrons Condensed Matter::Superconductivity 0103 physical sciences 010306 general physics Quantum tunnelling Superconductivity Physics Multidisciplinary Condensed matter physics Condensed Matter - Superconductivity Conductance General Chemistry 021001 nanoscience & nanotechnology Magnetic field Vortex Density of states 0210 nano-technology |
| Zdroj: | Nature Communications Nature Communications, Vol. 7, No 11139 (2016) Nature Communications, Vol 7, Iss 1, Pp 1-6 (2016) |
| ISSN: | 2041-1723 |
| Popis: | The observation by scanning tunnelling spectroscopy of Abrikosov vortex cores in the high-temperature superconductor YBa2Cu3O7−δ (Y123) has revealed a robust pair of electron-hole symmetric states at finite subgap energy. Their interpretation remains an open question because theory predicts a different signature in the vortex cores, characterized by a strong zero-bias conductance peak. Here, we present scanning tunnelling spectroscopy data on very homogeneous Y123 at 0.4 K revealing that the subgap features do not belong to vortices: they are actually observed everywhere along the surface with high spatial and energy reproducibility, even in the absence of magnetic field. Detailed analysis and modelling show that these states remain unpaired in the superconducting phase and belong to an incoherent channel, which contributes to the tunnelling signal in parallel with the superconducting density of states. Quantized subgap states measured in the vortex cores of YBa2Cu3O7−δ have been challenging theory for over twenty years. Here, the authors show that these spectral features identified as vortex-core states exist independent of vortices, which calls for revisiting vortices in cuprate superconductors. |
| Databáze: | OpenAIRE |
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