| Issue |
EPL
Volume 85, Number 1, January 2009
|
|
|---|---|---|
| Article Number | 17004 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/85/17004 | |
| Published online | 07 January 2009 | |
Observation of vortices and hidden pseudogap from scanning tunneling spectroscopic studies of the electron-doped cuprate superconductor Sr0.9La0.1CuO2
1
Department of Physics, California Institute of Technology - Pasadena, CA 91125, USA
2
National Creative Research Initiative Center for Superconductivity, Department of Physics, Sogang University Seoul, Korea 121-742
Corresponding author: ncyeh@caltech.edu
Received:
2
September
2008
Accepted:
27
November
2008
We present the first demonstration of vortices in an electron-type cuprate superconductor, the highest Tc(=43 K) electron-type cuprate Sr0.9La0.1CuO2. Our spatially resolved quasiparticle tunneling spectra reveal a hidden low-energy pseudogap inside the vortex core and unconventional spectral evolution with temperature and magnetic field. These results cannot be easily explained by the scenario of pure superconductivity in the ground state of high-Tc superconductivity.
PACS: 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects / 74.25.Op – Mixed states, critical fields, and surface sheaths / 74.72.Jt – Other cuprates, including Tl- and Hg-based cuprates
© EPLA, 2009
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