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Author Haberkorn, N.; Bengio, S.; Suárez, S.; Pérez, P.D.; Hofer, J.A.; Sirena, M.
Title Effect of thermal annealing and irradiation damage on the superconducting critical temperature of nanocrystalline γ-Mo2N thin films Type Journal Article
Year 2019 Publication Materials Letters Abbreviated Journal
Volume 236 Issue Pages 252-255
Keywords Nitrides; Sputtering; Superconductivity; Irradiation
Abstract We report on the influence of the disorder and stoichiometry in the resulting superconducting critical temperature of γ-Mo2N thin films. Initially, three films (with Tc values of 7.6 K, 6.8 K and 6 K) were grown at room temperature by reactive sputtering, on Si (1 0 0) using different N2/(Ar+N2) mixtures. The influence of the thermal annealing up to 973 K and irradiation damage produced by 1 MeV Zr+(fluence up 2 × 1014 cm−2) is analyzed. The Tc of pristine films remains unchanged for increasing irradiation doses up 2 × 1014 cm−2. The Tc for annealed films decreases close to the value expected for bulk samples (≈5 K) for increasing the annealing temperature. Successive irradiations of the annealed films tend to increase their Tc up to its initial values (before annealing). The results indicate that the Tc in nanometric grain size γ-Mo2N thin films is affected by both nitrogen stoichiometry and disorder at the atomic scale.
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ISSN 0167-577x ISBN Medium
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Call Number BT @ pedrazp @ Serial 850
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