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Superconductivity and Phase Diagram in the Nanostructured Eutectic Ga-Ag Alloy

DOI: 10.21883/PSS.2022.08.54608.360

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, 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

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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 iota-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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