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Spontaneous Currents in a Ferromagnet-Normal Metal-Superconductor Trilayer

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Krawiec M., Annett J., Györffy B.

Acta Physica Polonica A

2006

vol. 109

issue 4-5

507-512

We discuss the ground state properties of the system composed of a normal metal sandwiched between ferromagnet and superconductor within a tight binding Hubbard model. We solved the spin-polarized Hartree-Fock-Gorkov equations together with the Maxwell equation (Ampere's law) and found a proximity induced Fulde-Ferrell-Larkin-Ovchinnikov state in this system. Here we show that the inclusion of the normal metal layer in between those subsystems does not necessarily lead to the suppression of the Fulde-Ferrell-Larkin-Ovchinnikov phase. Moreover, we found that depending on the thickness of the normal metal slab the system can be switched periodically between the state with the spontaneous current flowing to that one with no current. All these effects can be explained in terms of the Andreev bound states formed in such structures.

Van Hove Singularity and Superconductivity in Disordered Sr_{2}RuO_{4}

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Litak G., Annett J., Györffy B.

Acta Physica Polonica A

2000

vol. 97

issue 1

249-252

On the basis of a simple model we analyse the influence of disorder on critical temperature T_{c} in p-wave superconductors. The disorder is treated by means of the coherent potential approximation and we focus our attention on the effect of a van Hove singularity near Fermi energy E_{F}. For the appropriate values of its parameters our model reproduces the experimentally found behaviour of Sr_{2} RuO_{4}.

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2 Acta Physica Polonica A

1 2006

1 2000

2 Annett J.

2 Györffy B.

1 Krawiec M.

1 Litak G.

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Spontaneous Currents in a Ferromagnet-Normal Metal-Superconductor Trilayer

Van Hove Singularity and Superconductivity in Disordered Sr_{2}RuO_{4}