Modulation of superconductivity by a magnetic template in Nb∕BaFe12O19 hybrids
Zhaorong Yang, Koen Vervaeke, Victor V. Moshchalkov, Ritta Szymczak
DOI 10.1103/PhysRevB.73.224509 · Physical Review B
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Abstract
Inhomogeneous magnetic fields generated by the BaFe12O19 ferromagnetic substrate create a magnetic template for superconducting condensate in the Nb∕BaFe12O19 hybrids. Depending on the field and temperature, the magnetic template guides superconductivity to nucleate in different areas: above the magnetic domain walls of the BaFe12O19 forming the domain-wall superconductivity (DWS), above the reversed magnetic domains (RDS), and above the positive magnetic domains forming bulk superconductivity. The DWS, behaving as a superconducting wire network, survives in a broad field range. The RDS, existing in the form of isolated superconducting islands near the saturation field Hs of BaFe12O19, can be described as a two-dimensional two-component random conductor mixture. Being related to the hysteretic domain evolution, superconducting condensate above the reversed domains shows pronounced switching behavior.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.2 | Pressure not reported | onset |
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