Resistive state measurements of quasi-0-dimensional superconducting structuresстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:High resolution e-beam lithographic process has been used to fabricate thin film aluminum nanostructures with the line width up to 40 nm. Single crystalline samples (tin whiskers with (sub)micron spaced probes) has been also prepared. In a wide temperature range below the superconducting transition such small objects could be considered as quasi-0-dimensional, as their physical dimensions are comparable to the characteristic value of the coherence length. Conventional 4-probes measurements were performed at helium temperatures. It was observed that at the top of the superconducting transition the resistance may significantly exceed its normal state value. The magnitude of this ‘’resistance bump” depends upon the bias current and the external magnetic field. No anomaly has been observed for samples longer than several microns. The results are discussed within the models of the phase-slip centers activation (strong current limit) and the N/S boundary propagation (zero current limit).