Physics – Condensed Matter – Superconductivity
Scientific paper
2006-10-11
Phys. Rev. B 79, 144508 (2009)
Physics
Condensed Matter
Superconductivity
final version, published in Phys. Rev. B
Scientific paper
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.
Alff Lambert
Bennemann Karl
Kastening Boris
Morr Dirk. K.
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