Pirozerskii A. L. 1, Charnaya E. V. 1, Abdulamonov Kh. A. 1, Likholetova M. V. 1, Kumzerov Yu. A.2, Fokin A. V.2
1St. Petersburg State University, St. Petersburg, Russia
2Ioffe Institute, St. Petersburg, Russia
Email: e.charnaya@spbu.ru
The paper presents studies of thermomagnetic instabilities in the nanocomposite porous glass/Bi-Sn alloy within a temperature range of superconductivity. Measurements of the temperature dependence of magnetization at a field of 10 G revealed the superconducting transition with temperature 4.2 K. The magnetization isotherms below the transition temperature corresponded to type II superconductivity with strong pinning. Incomplete jumps of magnetization were observed in the central part of the hysteresis loops at close values of external magnetic field. The hysteresis loops with magnetic instabilities were numerically modeled within the framework of the adiabatic approach modified taking into consideration the finite rate of temperature relaxation in the sample. Keywords: superconductivity, magnetic instabilities, nanocomposite porous glass/Bi-Si alloy, magnetization isotherms.
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