Abstract:
High-quality aluminum films on GaAs substrates are studied experimentally. The critical temperature of superconductivity is found to increase markedly with decreasing the film thickness. The observed phenomenon is considered as a manifestation of the quantum confinement effect, which affects both the density of states and the electron–phonon interaction.
This work was conducted within Russian–Greek collaboration project RFMEFI61717X0001 and T4ΔPΩ-00031. The results were analyzed and the paper was prepared by K.Yu.A. The work was also supported within project no. 19-01-050 under the Program “Research Fund of the National Research University "Higher School of Economics” in 2019–2020” and within state support program “5-100” for leading Russian universities.
Citation:
K. Yu. Arutyunov, E. A. Sedov, I. A. Golokolenov, V. V. Zav'yalov, G. Konstantinidis, A. Stavrinidis, G. Stavrinidis, I. Vasileiadis, T. Kehagias, G. P. Dimitrakopulos, F. Komninou, M. D. Kroitoru, A. A. Shanenko, “Quantum size effect in superconducting aluminum films”, Fizika Tverdogo Tela, 61:9 (2019), 1609–1613; Phys. Solid State, 61:9 (2019), 1559–1562
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S. Giaremis, Ph. Komninou, Th. Karakostas, J. Kioseoglou, “Ab Initio Study of the Electron–Phonon Coupling in Ultrathin Al Layers”, J Low Temp Phys, 203:1-2 (2021), 180
A.S. Samsonova, P.I. Zolotov, E.M. Baeva, A.I. Lomakin, N.A. Titova, Anna I. Kardakova, G.N. Goltsman, “Signatures of Surface Magnetic Disorder in Niobium Films”, IEEE Trans. Appl. Supercond., 31:5 (2021), 1