Josephson π State in a Ferromagnetic Insulator

Shiro Kawabata; Yasuhiro Asano; Yukio Tanaka; Alexander A. Golubov; Satoshi Kashiwaya

doi:10.1103/PhysRevLett.104.117002

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Josephson π State in a Ferromagnetic Insulator

Shiro Kawabata, Yasuhiro Asano, Yukio Tanaka, Alexander A. Golubov, Satoshi Kashiwaya

DOI 10.1103/PhysRevLett.104.117002 · Physical Review Letters

T1

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Abstract

We predict anomalous atomic-scale 0−π transitions in a Josephson junction with a ferromagnetic-insulator (FI) barrier. The ground state of such junction alternates between 0 and π states when thickness of FI is increasing by a single atomic layer. We find that the mechanism of the 0−π 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 a stable π state can be realized in junctions based on high-Tc superconductors with a La2BaCuO5 barrier.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown