Superconductivity on Interfaces of Nonsuperconducting Granules La2CuO4 and La1.56Sr0.44CuO4 |
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| Authors: | A. A. Bykov K. Yu. Terent’ev D. M. Gokhfeld N. E. Savitskaya S. I. Popkov M. I. Petrov |
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| Affiliation: | 1.Petersburg Nuclear Physics Institute named by B.P. Konstantinov of National Research Centre “Kurchatov Institute”,Orlova roshcha,Russia;2.Kirensky Institute of Physics,Federal Research Center KSC SB RAS,Krasnoyarsk,Russia;3.Siberian Federal University,Krasnoyarsk,Russia |
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| Abstract: | 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. |
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