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Phase Sensitive Experiments in Ferromagnetic-Based Josephson Junctions

W. Guichard, M. Aprili, O. Bourgeois, T. Kontos, J. Lesueur, P. Gandit

DOI 10.1103/PhysRevLett.90.167001 · Physical Review Letters

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Abstract

We have measured the ground state of ferromagnetic Josephson junctions using a single dc SQUID (superconducting quantum interference device).We show that the Josephson coupling is either positive (0 coupling) or negative (π coupling) depending on the ferromagnetic layer thickness. As expected, the sign change of the Josephson coupling is observed as a shift of half a quantum flux in the SQUID diffraction pattern when operating in the linear limit.

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FormulaReported Tc (K)Pressure (GPa)Type
Nb

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7Pressure not reportedonset

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