Energy Relaxtation and Hot Spot Formation in Superconducting Single Photon Detectors SSPDSI.N. Florya, Yu. P. Korneeva, M.V. Sidorova, A.D. Golikov, I.A. Gaiduchenko, G.E. Fedorov, A.A. Korneev, B.M. Voronov and G.N. GoltsmanEPJ Web of Conferences, 103 (2015) 10004DOI: https://doi.org/10.1051/epjconf/201510310004