Josephson pi-state in a ferromagnetic insulator

Abstract

We predict anomalous atomic-scale 0-pi transitions in a Josephson junction with a ferromagnetic-insulator (FI) barrier. The ground state of such junction alternates between 0- and pi-states when thickness of FI is increasing by a single atomic layer. We find that the mechanism of the 0-pi transition can be attributed to thickness-dependent phase-shifts between the wave numbers of electrons and holes in FI. Based on these results, we show that stable pi-state can be realized in junctions based on high-Tc superconductors with La${}_2$BaCuO${}_5$ barrier.

4 pages, 3 figures, Phys. Rev. Lett. (2010) in press

References in corpus (6)

• Macroscopic quantum tunneling in a d-wave high-Tc superconductor
• Enhanced Macroscopic Quantum Tunneling in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ Intrinsic Josephson Junction Stacks
• Decoherence due to nodal quasiparticles in d-wave qubits
• Macroscopic quantum dynamics of pi-junctions with ferromagnetic insulators
• Switching Dynamics of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ Intrinsic Josephson junctions: Macroscopic Quantum Tunneling and Self-Heating Effect
• Theory of Macroscopic Quantum Tunneling in High-T_c c-Axis Josephson Junctions

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