TY - JOUR AU - Bell, M. AU - Kaurova, N. AU - Divochiy, A. AU - Gol'tsman, G. AU - Bird, J. AU - Sergeev, A. AU - Verevkin, A. PY - 2007 DA - 2007// TI - On the nature of resistive transition in disordered superconducting nanowires T2 - IEEE Trans. Appl. Supercond. JO - IEEE Trans. Appl. Supercond. SP - 267 EP - 270 VL - 17 IS - 2 KW - SSPD KW - SNSPD AB - Hot-electron single-photon counters based on long superconducting nanowires are starting to become popular in optical and infrared technologies due to their ultimately high sensitivity and very high response speed. We investigate intrinsic fluctuations in long NbN nanowires in the temperature range of 4.2 K-20 K, i.e. above and below the superconducting transition. These fluctuations are responsible for fluctuation resistivity and also determine the noise in practical devices. Measurements of the fluctuation resistivity were performed at low current densities and also in external magnetic fields up to 5 T. Above the BCS critical temperature T co the resistivity is well described by the Aslamazov-Larkin (AL) theory for two-dimensional samples. Below T co the measured resistivity is in excellent agreement with the Langer-Ambegaokar-McCumber-Halperin (LAMH) theory developed for one-dimensional superconductors. Despite that our nanowires of 100 nm width are two-dimensional with respect to the coherence length, our analysis shows that at relatively low current densities the one-dimensional LAMH mechanism based on thermally induced phase slip centers dominates over the two-dimensional mechanism related to unbinding of vortex-antivortex pairs below the Berezinskii-Kosterlitz-Thouless transition. SN - 1051-8223 UR - https://ieeexplore.ieee.org/document/4277290/ UR - https://doi.org/10.1109/TASC.2007.898619 DO - 10.1109/TASC.2007.898619 N1 - exported from refbase (https://db.rplab.ru/refbase/show.php?record=1247), last updated on Thu, 06 May 2021 16:17:08 -0500 ID - Bell_etal2007 ER -