Nonmonotonic forms of resistive superconducting transition as a function of temperature and magnetic field have been observed in granular high-Tc ceramics of the electron-type family L_2-x{M}ₓCuO_4-y. The behavior is compared with that of low-temperature granular superconductors and is treated by the conventional terms of the energy gap and Josephson and quasiparticle tunnelings. The values of the intragranular upper critical field Hc2 perpendicular to the a-b plane of Sm-Ce-Cu-O are extracted. We find evidence for the appearance of superconductivity in individual grains at temperatures significantly higher than the resistance onset temperature.
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Gerber et al. (1991) studied this question.
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