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We have calculated current-voltage characteristic curves fornormal-superconducting junctions with Andreev reflections and different typesof electronic bands. We found that when the normal band is narrow, of the orderof the superconducting energy gap, a negative differential resistance appearsat a voltage of the order of the band width plus the gap value. In case twobands contribute to the total current the conductance can be smaller than unityat voltages above the gap value. Our simulations may provide an answer todifferent experimental data of the literature that were not yet understood.

Negative differential resistance in normal narrow bands - superconducting junctions with Andreev reflection