A route for a strong increase of critical current in nanostrained iron-based superconductors
| Autor: | Jan Jaroszynski, Weidong Si, Juan Zhou, Toshinori Ozaki, Yimei Zhu, Cheng Zhang, Qiang Li, Lijun Wu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
High-temperature superconductivity
Proton Science General Physics and Astronomy 02 engineering and technology 01 natural sciences Article General Biochemistry Genetics and Molecular Biology law.invention law Condensed Matter::Superconductivity 0103 physical sciences Proximity effect (superconductivity) 010306 general physics Physics Superconductivity Multidisciplinary Condensed matter physics General Chemistry 021001 nanoscience & nanotechnology Vortex Magnetic field Cascade 0210 nano-technology Order of magnitude |
| Zdroj: | Nature Communications, Vol 7, Iss 1, Pp 1-9 (2016) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | The critical temperature Tc and the critical current density Jc determine the limits to large-scale superconductor applications. Superconductivity emerges at Tc. The practical current-carrying capability, measured by Jc, is the ability of defects in superconductors to pin the magnetic vortices, and that may reduce Tc. Simultaneous increase of Tc and Jc in superconductors is desirable but very difficult to realize. Here we demonstrate a route to raise both Tc and Jc together in iron-based superconductors. By using low-energy proton irradiation, we create cascade defects in FeSe0.5Te0.5 films. Tc is enhanced due to the nanoscale compressive strain and proximity effect, whereas Jc is doubled under zero field at 4.2 K through strong vortex pinning by the cascade defects and surrounding nanoscale strain. At 12 K and above 15 T, one order of magnitude of Jc enhancement is achieved in both parallel and perpendicular magnetic fields to the film surface. Simultaneous increase of critical temperature and critical current in superconductors is desirable for application purpose, but very difficult to realize. Here, Ozaki et al. report a simultaneous enhancement of Tc and Jc in FeSe0.5Te0.5 films with cascade defects produced by low-energy proton irradiation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|