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Current transfer and initial dissipation in high-Tc superconductors (CROSBI ID 80983)

Prilog u časopisu | pregledni rad (znanstveni) | međunarodna recenzija

Prester, Mladen Current transfer and initial dissipation in high-Tc superconductors // Superconductor science and technology, 11 (1998), 4; 333-357-x

Podaci o odgovornosti

Prester, Mladen

engleski

Current transfer and initial dissipation in high-Tc superconductors

Various aspects of the problem of current transfer in high-Tc superconductors (HTS) are reviewed. The spatial inhomogeneities of various types are identified as a primary cause of non-uniformity of both normal and super-currents in real samples of HTS. The role these inhomogeneities play in transport features of the samples is discussed. The case of grain boundaries in polycrystalline samples is elaborated in detail. The local structural and transport properties of isolated grain boundaries were first reviewed and then integrated into the knowledge of global (macroscopic) charge transport. The paper emphasises the common ingredients characterising the transport in various forms and families of HTS samples in small magnetic fields. The phenomenon of percolation is identified as the most obvious one and is shown to dominate a large number of observations covered by this report. The experimental results focused by this report elaborate primarily the problems of critical currents, initial dissipation and current-voltage characteristics, penetration depth, resistive and metal-insulator transition, resistance noise and magneto-optical studies of current paths. Various models for current transfer (disordered-bonds, brick-wall and railway-switch) are also reviewed and discussed.

superconductivity; high temperature superconductors; critical currents; weak link networks; Josephson junction; percolation;

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Podaci o izdanju

11 (4)

1998.

333-357-x

objavljeno

0953-2048

Povezanost rada

Fizika

Indeksiranost