Extremely long-range, high-temperature Josephson coupling across a half-metallic ferromagnet
| Autor: | Sergio Valencia, José M. González-Calbet, A. Rivera, V. Rouco, Xavier Palermo, A. Balan, Alexander Buzdin, Mariona Cabero, Anke Sander, Cheryl Feuillet-Palma, Salvatore Mesoraca, Javier Tornos, Jesus Santamaria, Mirko Rocci, D. Sanchez-Manzano, Mar García-Hernández, F. Cuéllar, Javier Garcia-Barriocanal, Federico Mompean, C. Leon, Gloria Orfila, Jerome Lesueur, Javier E. Villegas, Lourdes Marcano, Nicolas Bergeal, Fernando Gallego |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
Superconductivity Josephson effect Condensed matter physics Spin polarization Spintronics Mechanical Engineering General Chemistry Condensed Matter Physics Condensed Matter::Materials Science Quantization (physics) Mechanics of Materials Quantum state Condensed Matter::Superconductivity Condensed Matter::Strongly Correlated Electrons General Materials Science Quantum Quantum computer |
| Zdroj: | Repositorio Institucional del Instituto Madrileño de Estudios Avanzados en Nanociencia instname Nature Materials |
| ISSN: | 1476-4660 |
| Popis: | The Josephson effect results from the coupling of two superconductors across a spacer such as an insulator, a normal metal or a ferromagnet to yield a phase coherent quantum state. However, in junctions with ferromagnetic spacers, very long-range Josephson effects have remained elusive. Here we demonstrate extremely long-range (micrometric) high-temperature (tens of kelvins) Josephson coupling across the half-metallic manganite La0.7Sr0.3MnO3 combined with the superconducting cuprate YBa2Cu3O7. These planar junctions, in addition to large critical currents, display the hallmarks of Josephson physics, such as critical current oscillations driven by magnetic flux quantization and quantum phase locking effects under microwave excitation (Shapiro steps). The latter display an anomalous doubling of the Josephson frequency predicted by several theories. In addition to its fundamental interest, the marriage between high-temperature, dissipationless quantum coherent transport and full spin polarization brings opportunities for the practical realization of superconducting spintronics, and opens new perspectives for quantum computing. Josephson coupling over micrometres and at tens of kelvins is demonstrated across the half-metallic manganite La0.7Sr0.3MnO3 combined with the superconducting cuprate YBa2Cu3O7. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink