Superconductivity on Interfaces of Nonsuperconducting Granules La2 CuO4 and La1.56 Sr0.44 CuO4
URI (for links/citations):https://link.springer.com/article/10.1007%2Fs10948-018-4668-x
Bykov, A. A.
Terent’Ev, K. Yu.
Gokhfeld, D. M.
Savitskaya, N. E.
Popkov, S. I.
Petrov, M. I.
Институт управления бизнес-процессами и экономики
Кафедра экономики и информационных технологий менеджмента
Journal Name:Journal of Superconductivity and Novel Magnetism
Journal Quartile in Scopus:Q3
Journal Quartile in Web of Science:Q4
Bibliographic Citation:Bykov, A. A. Superconductivity on Interfaces of Nonsuperconducting Granules La2 CuO4 and La1.56 Sr0.44 CuO4 [Текст] / A. A. Bykov, K. Yu. Terent’Ev, D. M. Gokhfeld, N. E. Savitskaya, S. I. Popkov, M. I. Petrov // Journal of Superconductivity and Novel Magnetism. — 2018. — Т. 31.
Composite materials fabricated by annealing of nonsuperconducting ceramics La2CuO4 and La1.56Sr0.44CuO4 at 910 °C during various time are investigated. Areas of superconducting La1.85Sr0.15CuO4 phase arises at boundaries of contacting nonsuperconducting granules. The volume fraction of the superconducting phase increases with increasing annealing time. A model describing the magnetic and transport properties of the samples at low magnetic fields is constructed. The magnetotransport characteristics of obtained samples at low magnetic fields (∼ 100 Oe) are defined by weak links network formed by superconducting areas. At high fields, behavior of the system is defined by a magnetization of the disconnected superconducting islands. The average size of the superconducting areas has been estimated from an extended critical state model.