Signatures of Surface Magnetic Disorder in Niobium Films

We present our studies on the evolution of the normal and superconducting properties with thickness of thin Nb films with a low level of non-magnetic disorder (k_Fl\approx 150 for the thickest film in the set). The analysis of the superconducting behavior points to the presence of magnetic moments,...

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Veröffentlicht in:	IEEE transactions on applied superconductivity 2021-08, Vol.31 (5), p.1-5, Article 7000205
Hauptverfasser:	Samsonova, A.S., Zolotov, P.I., Baeva, E.M., Lomakin, A.I., Titova, N.A., Kardakova, Anna I., Goltsman, G.N.
Format:	Artikel
Sprache:	eng
Schlagworte:	Abrikosov-Gorkov model Engineering Engineering, Electrical & Electronic Low level Magnetic moments Magnetism Niobium Physical Sciences Physics Physics, Applied Resistance Scattering Science & Technology Substrates Superconducting magnets superconducting thin films Superconducting transition temperature Superconductivity Technology Temperature dependence Temperature measurement Thickness Thin films
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Beschreibung
Zusammenfassung:	We present our studies on the evolution of the normal and superconducting properties with thickness of thin Nb films with a low level of non-magnetic disorder (k_Fl\approx 150 for the thickest film in the set). The analysis of the superconducting behavior points to the presence of magnetic moments, hidden in the native oxide on the surface of Nb films. Using the Abrikosov-Gorkov theory, we obtain the density of surface magnetic moments of 10^{13} cm^{-2}, which is in agreement with the previously reported data for Nb films.
ISSN:	1051-8223 1558-2515
DOI:	10.1109/TASC.2021.3065281