Yarman, Nuh TolgaGerashchenko, O. V.Kholmetskii, A. L.Mashlan, M.Yarman, T.Aldushchenkov, A. V.Okunev, I. S.Makhnach, L. V.Enerji Sistemleri Mühendisliği / Energy Systems Engineering2024-05-252024-05-25201501063-77611090-650910.1134/S10637761150600602-s2.0-84938823715https://doi.org/10.1134/S1063776115060060https://hdl.handle.net/20.500.14517/332Yarman, Tolga/0000-0003-3209-2264The penetration of a weak magnetic field into LaO0.85F0.15FeAs polycrystalline superconductors is investigated using two mutually complementing techniques: measurement of the higher harmonics of nonlinear magnetization and the current-voltage characteristics. The dependences of the critical current density and resistivity on the temperature and magnetic field strength are determined. The results confirm the theory of the critical state in the low-field electrodynamics of a Josephson medium. The universality of this theoretical concept is demonstrated for a new class of ceramic superconductors.eninfo:eu-repo/semantics/closedAccess[No Keyword Available]ArticleQ4Q3120610341040WOS:000358650800014