Non-local electron transport and cross-resistance peak in NSN heterostructures

Details Non-local electron transport and cross-resistance peak in NSN heterostructures Non-local electron transport and cross-resistance peak in NSN heterostructures

2007-12-10

arxiv.org/abs/0712.1408v1

JETP Lett. vol. 87, 140 (2008) [Pis'ma v ZhETF, vol. 87, 166 (2008)]

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1134/S0021364008030053

We develop a microscopic theory describing the peak in the temperature dependence of the non-local resistance of three-terminal NSN devices. This peak emerges at sufficiently high temperatures as a result of a competition between quasiparticle/charge imbalance and subgap (Andreev) contributions to the conductance matrix. Both the height and the shape of this peak demonstrate the power law dependence on the superconductor thickness $L$ in contrast to the zero-temperature non-local resistance which decays (roughly) exponentially with increasing $L$. A similar behavior was observed in recent experiments.

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