Вышедшие номера
Superconductivity and Phase Diagram in the Nanostructured Eutectic Ga-Ag Alloy
Российский научный фонд, 21-72-20038
Smetanin D.V.1, Likholetova M.V.1, Charnaya E.V.1, Lee M.K.2,3, Chang L.J.3, Shevchenko E.V.1, Kumzerov Yu.A.4, Fokin A.V.4
1Physics Department, St. Petersburg State University, St. Petersburg, Russia
2MOST Instrument Center at NCKU, Tainan, Taiwan
3Department of Physics, National Cheng Kung University, Tainan Taiwan
4Ioffe Institute, Russian Academy of Sciences, St. Petersburg, Russia
Email: dismet1998@mail.ru, marinalikholetova@yahoo.com, e.charnaya@spbu.ru, anion3143@hotmail.com, ljchang@mail.ncku.edu.tw, evgenii.sh@gmail.com, yu.kumzerov@mail.ioffe.ru, midbarzin@yandex.ru
Поступила в редакцию: 22 апреля 2022 г.
Выставление онлайн: 6 июня 2022 г.

Here, we present a study of superconductivity in the Ga-Ag alloy embedded into porous template with pore diameter of 10 nm. The composition was close to the eutectic point in the gallium-rich range. We measured DC and AC magnetizations for temperatures from 1.8 to 10 K and magnetic fields up to 6 T. Three superconducting transitions were found at temperatures 7.05, 6.08, and 2.65 K in contrast to the bulk counterpart. Upper critical field lines were obtained. Activation barriers were evaluated from the AC data. The temperatures of the superconducting transitions were ascribed to emergence of β- and t-Ga and of an intermetallic different from bulk Ag3Ga2. Keywords: nanostructured Ga-Ag eutectic alloy, superconducting transitions, segregated phases, DC and AC susceptibility.

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