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- W4298278310 abstract "We study the Josephson current, I_J, in a junction consisting of two s-wave superconductors that are separated by a ferromagnetic barrier possessing a magnetic and non-magnetic scattering potential, g and Z, respectively. We discuss the general dependence of I_J on g, Z, and the phase difference phi between the two superconductors. Moreover, we compute the critical current, I_c for given g and Z, and show that it possesses two lines of non-analyticity in the (g, Z)-plane. We identify those regions in the (g, Z)-plane where the Josephson current changes sign with increasing temperature without a change in the relative phase between the two superconductors, i.e., without a transition between a 0 and pi state of the junction. Finally, we show that by changing the relative phase phi, it is possible to tune the junction through a first-order quantum phase transition in which the spin polarization of the two superconductors' combined ground state changes from < S_z > =0 to < S_z > =1/2." @default.
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- W4298278310 date "2006-10-10" @default.
- W4298278310 modified "2023-09-29" @default.
- W4298278310 title "Charge Transport and Quantum Phase Transitions in Singlet Superconductor - Ferromagnet - Singlet Superconductor Junctions" @default.
- W4298278310 doi "https://doi.org/10.48550/arxiv.cond-mat/0610283" @default.
- W4298278310 hasPublicationYear "2006" @default.
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