| Autor: |
Di Bernardo, Angelo, Komori, Sachio, Livanas, Giorgio, Divitini, Giorgio, Gentile, Paola, Cuoco, Mario, Robinson, Jason W. A. |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Nat. Mater. 18, 1194 (2019) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1038/s41563-019-0476-3 |
| Popis: |
The superconducting equivalent of giant magnetoresistance, involves placing a thin-film superconductor between two ferromagnetic layers. A change of magnetization-alignment in such a superconducting spin-valve from parallel (P) to antiparallel (AP) creates a positive shift in the superconducting transition temperature ({\Delta}Tc) due to an interplay of the magnetic exchange energy and the superconducting condensate. The magnitude of {\Delta}Tc scales inversely with the superconductor thickness (dS) and is zero when dS exceeds the superconducting coherence length ({\xi}) as predicted by de Gennes. Here, we report a superconducting spin-valve effect involving a different underlying mechanism that goes beyond de Gennes in which magnetization-alignment and {\Delta}Tc are determined by the nodal quasiparticle-excitation states on the Fermi surface of the d-wave superconductor YBa2Cu3O7-{\delta} (YBCO) grown between insulating layers of ferromagnetic Pr0.8Ca0.2MnO3. We observe {\Delta}Tc values that approach 2 K with {\Delta}Tc oscillating with dS over a length scale exceeding 100 {\xi} and, for particular values of dS, we find that the superconducting state reinforces an antiparallel magnetization-alignment. These results pave the way for all-oxide superconducting memory in which superconductivity modulates the magnetic state. |
| Databáze: |
arXiv |
| Externí odkaz: |
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