Giant oscillations of the density of states and the conductance in a ferromagnetic conductor coupled to two superconductors

Details Giant oscillations of the density of states and the conductance in a ferromagnetic conductor coupled to two superconductors Giant oscillations of the density of states and the conductance in a ferromagnetic conductor coupled to two superconductors

2005-03-28

arxiv.org/abs/cond-mat/0503643v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

16 pages, 8 figures

Scientific paper

Giant oscillations of the density of electronic states and the differential conductance of a superconductor-ferromagnet-superconductor structure are predicted for the case when the exchange energy, $I_0$, due to the interaction between the electron spin and the spontaneous moment of the ferromagnet is smaller than the superconductor energy gap, $\Delta$. The effect is due to the extremely large degeneration of the energy level $\epsilon = I_0$ when the superconductor phase difference $\phi$ is close to odd multiple of $\pi$ ($\epsilon$ is the electron energy measured from the Fermi-energy). This quantum interference effect persists even in long ferromagnetic bridges whose length much exceeds the ''magnetic length'' ($\hbar v_{F}/I_{0}$ in the ballistic regime and $\sqrt{\hbar D/I_0}$ in the diffusive regime; $D$ is the electron diffusion constant). The predicted effect allows a direct spectroscopy of Andreev levels in the ferromagnet as well as a direct measurement of the exchange energy,$I_0$.

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