Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-01-25
J. Phys. Soc. Jpn. 76, 054705 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Corrected typos and added Journal-ref
Scientific paper
10.1143/JPSJ.76.054705
We study the influence of magnetic scattering on the Josephson critical current, Ic, in a superconductor/ferromagnetic metal/superconductor (SFS) junction by a tunneling Hamiltonian approach. An analytical formula of Ic is given in the fourth order perturbation theory as regards the tunneling matrix element. The Ic exhibits the damped oscillatory dependence on the thickness of the ferromagnetic metal, d, and shows the transition between 0- and pi-states with d. When the superconducting transition temperature is comparable to the ferromagnetic Curie temperature, the period of oscillation is obviously changed by increasing temperature, T, due to the magnetic scattering, which induces the 0-pi transition with T. The magnetic scattering provides rich variety of Josephson effect in the SFS junction. Our results present an appropriate condition of a superconductor and a ferromagnetic metal to control the 0- and the pi-states.
Hikino S.
Maekawa Sasamichi
Mori Masao
Takahashi Saburo
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