Coexistence of superconductivity and ferromagnetism in a nanocomposite based on porous glass with nickel and indium inclusions
Likholetova M. V. 1, Charnaya E. V. 1, Kumzerov Yu. A. 2, Fokin A. V. 2, Grigorieva N. R. 1, Mikushev V. M. 1, Shevchenko E. V. 1
1St. Petersburg State University, St. Petersburg, Russia
2Ioffe Institute, St. Petersburg, Russia
Email: marinalikholetova@yahoo.com, e.charnaya@spbu.ru, yu.kumzerov@mail.ioffe.ru, midbarzin@yandex.ru, n.r.grigorieva@spbu.ru, v.mikushev@spbu.ru, e.shevchenko@spbu.ru
A nanocomposite was made based on a porous glass with nickel and indium embedded into pores. Mean pore size was equal to 4.8 nm according to nitrogen porosimetry. Dc magnetization was measured within the temperature range 1.8 to 400 K and field range -70 to 70 kOe. The superconducting transition was observed at a temperature of 3.405 K in the field 10 Oe. Bifurcation of the magnetization curves obtained under the ZFC and FC protocols and hysteresis loops of magnetization above the superconducting temperature evidence ferromagnetic ordering. Shifts of the magnetization isotherms within the superconducting phase were found, which depended on the field change direction. The shift signs show the impact of the inverse and/or electromagnetic proximity effects. Keywords: superconductivity, ferromagnetism, magnetization, proximity effects, nanocomposite.
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