Sign control of the critical-temperature switching in oxide superconducting spin valves
Sachio Komori, Sogo Suzuki, Keiichiro Imura, Tomoyasu Taniyama
DOI 10.1103/6xqk-62jx · Physical Review Applied
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Abstract
In a ferromagnet/superconductor/ferromagnet (F/S/F) superconducting spin valve, the critical temperature (Tc) of S is controllable by the magnetization alignment of the two F layers through pair-breaking mechanisms such as magnetic exchange fields and stray fields. In high-Tc oxide superconducting spin valves, Tc-switching is more complicated than in metallic systems due to the anisotropic gap causing low-energy quasiparticle excitations down to low temperatures and, therefore, key parameters determining the origin, sign, and magnitude of Tc-switching have not been fully understood yet. Here, we systematically investigate oxide superconducting spin valves with various F layers and demonstrate that the electrical resistivity of the F layers determines the sign of Tc-switching. We find that insulating F layers that can suppress proximity leakage of Cooper pairs lead to magnetic-exchange-field-induced Tc-switching while conducting F layers lead to Tc-switching with the opposite sign. The results offer insight into the origins of the complex Tc-switching effects in oxide superconducting spin valves and are useful in designing oxide superconducting spintronic devices.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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