Interplay between superconductivity and ferromagnetism in epitaxial Nb(110)∕Au(111)∕Fe(110) trilayers
Hiroki Yamazaki, Nic Shannon, Hidenori Takagi
DOI 10.1103/PhysRevB.73.094507 · Physical Review B
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Abstract
In order to clarify the influence of ferromagnetism on superconductivity through a normal-metal layer, the superconducting properties of epitaxial Nb(110)∕Au(111)∕Fe(110) trilayers were studied as a function of the thickness tAu of the intervening Au layer. Structural characterization of the samples revealed sharp interfaces, almost free from roughness. A strong suppression of the superconducting transition temperature Tc was observed for tAu<10Å, implying a strong spin polarization of the Au layer in the vicinity of the Au∕Fe interface. A periodic change of Tc with a period of ∼21Å (∼ nine atomic monolayers of Au) was observed for 20<tAu<104Å. Neither the Fermi surface nesting of the normal-metal layer nor Fulde-Ferrel-Larkin-Ovchinnikov oscillations induced by a superconducting proximity effect in the ferromagnet can by themselves account for the observed period. These results suggest that a more subtle form of quantum interference occurs in very clean trilayer systems.
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. | 9.04 | Pressure not reported | unknown |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.23 | Pressure not reported | unknown |
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