Anomalous transport in normal-superconducting and ferromagnetic-superconducting nanostructures

Details Anomalous transport in normal-superconducting and ferromagnetic-superconducting nanostructures Anomalous transport in normal-superconducting and ferromagnetic-superconducting nanostructures

1998-11-16

arxiv.org/abs/cond-mat/9811216v1

Physics

Condensed Matter

Superconductivity

6 figures. Submitted to PRB Rapid comm

Scientific paper

10.1103/PhysRevB.59.6031

We have calculated the temperature dependence of the conductance variation ($\delta S(T)$) of mesoscopic superconductor normal metal(S/N) structures, in the diffusive regime, analysing both weak and strong proximity effects. We show that in the case of a weak proximity effect there are two peaks in the dependence of $\delta S(T)$ on temperature. One of them (known from previous studies) corresponds to a temperature $T_1$ of order of the Thouless energy ($\epsilon_{Th}$), and another, newly predicted maximum, occurs at a temperature $T_2$ where the energy gap in the superconductor $\Delta(T_2)$ is of order $\epsilon_{Th}$. In the limit $L_{\phi}

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