Critical current oscillations and sign-reversal diode effect in planar SNS Josephson junctions: Manifestation of interface vortices

D. Yu. Vodolazov; K. B. Polevoy; A. G. Shishkin; S. V. Egorov; P. R. Kuznetsova; A. A. Elistratova; S. V. Bakurskiy; V. S. Stolyarov

doi:10.1103/r628-qp67

Critical current oscillations and sign-reversal diode effect in planar SNS Josephson junctions: Manifestation of interface vortices

D. Yu. Vodolazov, K. B. Polevoy, A. G. Shishkin, S. V. Egorov, P. R. Kuznetsova, A. A. Elistratova, S. V. Bakurskiy, V. S. Stolyarov

DOI 10.1103/r628-qp67 · Physical Review B

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Abstract

We report the experimental observation of oscillations in the critical current Ic of SNS Josephson junctions as a function of in-plane magnetic field B∥ (where S is Nb and N is Al above its critical temperature). Our theoretical calculations within the Ginzburg-Landau framework demonstrate that at sufficiently large B∥, in-plane vortices enter the N layer, pin on the SN interface, and partially penetrate the S layer in the banks of the SNS junction. These interface vortices significantly affect the proximity-induced superconductivity in the normal weak link, leading to pronounced oscillations in the critical current Ic(B∥). We also observe a superconducting diode effect of orbital origin that undergoes sign reversal with variations in the magnetic field.

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.	—	Pressure not reported	unknown
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown