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Author Hofer, J.A.; Ginzburg, M.; Bengio, S.; Haberkorn, N.
Title Nanocrystalline superconducting γ-Mo2N ultra-thin films for single photon detectors Type Journal Article
Year 2022 Publication Materials Science and Engineering: B Abbreviated Journal Materials Science and Engineering: B
Volume 275 Issue Pages 115499
Abstract We analyze the influence of the surface passivation produced by oxides on the superconducting properties of γ-Mo2N ultra-thin films. The superconducting critical temperature of thin films grown directly on Si (100) with those using a buffer and a capping layer of AlN are compared. The results show that the cover layer avoids the presence of surface oxides, maximizing the superconducting critical temperature for films with thicknesses of a few nanometers. We characterize the flux-flow instability measuring current-voltage curves in a 6.4 nm thick Mo2N film with a superconducting critical temperature of 6.4 K. The data is analyzed using the Larkin and Ovchinnikov model. Considering self-heating effects due to finite heat removal from the substrate, we determine a fast quasiparticle relaxation time ≈ 45 ps. This value is promising for its applications in single-photon detectors.
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ISSN 0921-5107 ISBN Medium
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Call Number BT @ pedrazp @ Serial 871
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