Article
Effect of O+ ion irradiation on the magnetic properties of superconducting magnesium diboride composites
S. V. Veselova
Institute of Physics, Kazan (Volga Region) Federal University, Kremlyovskaya, 16a, 420008, Kazan, Russian
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe Highway, 31, 115409, Moscow, Russian
P. А. Fedin
National Research Center “Kurchatov Institute”, Akademika Kurchatova square, 123182, Moscow, Russian
I. V. Yanilkin
Institute of Physics, Kazan (Volga Region) Federal University, Kremlyovskaya, 16a, 420008, Kazan, Russian
М. А. Cherosov
Institute of Physics, Kazan (Volga Region) Federal University, Kremlyovskaya, 16a, 420008, Kazan, Russian
А. I. Gumarov
Institute of Physics, Kazan (Volga Region) Federal University, Kremlyovskaya, 16a, 420008, Kazan, Russian
D. S. Uvin
Institute of Physics, Kazan (Volga Region) Federal University, Kremlyovskaya, 16a, 420008, Kazan, Russian
Т. V. Kulevoy
National Research Center “Kurchatov Institute”, Akademika Kurchatova square, 123182, Moscow, Russian
R. G. Batulin
Institute of Physics, Kazan (Volga Region) Federal University, Kremlyovskaya, 16a, 420008, Kazan, Russian
e-mail: tokamak@yandex.ru
Abstract
The results of a study on the effect of ion irradiation (O+ ions, E = 20 keV) in radiation defect generation modes on the critical temperature and current of high-temperature superconducting magnesium diboride (MgB₂) composites are presented. An analysis was performed, including both the integral critical current derived from sample magnetization measurements and the determination of the critical temperature from vibrating sample magnetometry data. It is shown that at an ion fluence of 1·10¹³ ions/cm², a 3.5-fold increase in the critical current density (Jc) is observed in the radiation defect generation regime. In contrast, at a fluence of 1·10¹⁴ ions/cm², a slight decrease in Jc is observed, along with the absence of a Meissner phase in the superconductor bulk, as indicated by vibrating sample magnetometry.
Keywords: magnesium diboride; high-temperature superconductor; irradiation, radiation defects; critical current; magnetization.
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