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Regular version of the site

Article

Characterization of MoSi Superconducting Single-Photon Detectors in the Magnetic Field

IEEE Transactions on Applied Superconductivity. 2015. Vol. 25. No. 3. P. 1-4.
Korneev A., Korneeva Y., Mikhailov M., Pershin Y., Semenov A., Vodolazov D., Divochiy A., Vakhtomin Y., Smirnov K., Sivakov A., Devizenko A., Goltsman G.

We investigate the response mechanism of nanowire superconducting single-photon detectors (SSPDs) made of amorphous MoxSi1-x. We study the dependence of photon count and dark count rates on bias current in magnetic fields up to 113 mT at 1.7 K temperature. The observed behavior of photon counts is similar to the one recently observed in NbN SSPDs. Our results show that the detecting mechanism of relatively high-energy photons does not involve the vortex penetration from the edges of the film, and on the contrary, the detecting mechanism of low-energy photons probably involves the vortex penetration from the film edges.