The phenomenon of dark counts in nanostripes of different superconductor systems such as high-temperature superconducting YBa2Cu3O7-x and superconductor/ferromagnet hybrids consisting of either NbN/NiCu or YBa2Cu3O7- x/L0.7Sr0.3MnO3 bilayers have been investigated. For NbN/NiCu the rate of dark-count transients have been reduced with respect to pure NbN nanostripes and the events were dominated by a single vortex entry from the edge of the stripe. In the case of nanostripes based on YBa2Cu3O7-x, we have found that thermal activation of vortices was also, apparently, responsible for triggering dark-count signals.
L. Parlato, M. Ejrnaes, U. Nasti, R. Arpaia, T. Taino, T. Bauch, H. Myoren, Roman Sobolewski, F. Tafuri, F. Lombardi, R. Cristiano, and G. Pepe, "Investigation of dark counts in innovative materials for superconducting nanowire single-photon detector applications," Proc. SPIE 10229, Photon Counting Applications 2017, 102290I (Presented at SPIE Optics + Optoelectronics: April 25, 2017; Published: 15 May 2017); https://doi.org/10.1117/12.2267647.
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