DOUBLE RESISTIVE SUPERCONDUCTING TRANSITION IN SM2-XCEXCUO4-Y - COMMENT

Recently, E. A. Early et al. [Phys. Rev. B 47, 433 (1993)] presented resistivity measurements on Sm2-xCexCuO4-y polycrystalline samples exhibiting double-step resistive superconducting transitions, and drew general conclusions about the behavior of granular electron-doped compounds. We point out that the behavior observed in this family of compounds is very sample dependent, and that many different and richer cases of this can be found, the one described by the authors being merely a particular example. We also discuss unusual signatures of the beginning of superconducting transitions in inhomogeneous samples. © 1995 The American Physical Society.