Percolative superconductor-to-insulator transition in Eu1.5Ce0.5NbSr2Cu2O10

Y. Levi, I. Felner, U. Asaf, O. Millo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We employed scanning tunneling microscopy and spectroscopy combined with macroscopic resistivity and magnetization measurements in the study of the superconductor-to-insulator transition in ceramic Eu1.5Ce0.5NbSr2Cu2O10. This superconductor (TC = 29 K) is made insulating by hydrogen doping in a nondestructive way, allowing for a reversible transition. We found that although the samples were nominally homogeneous the resistivity and magnetization data are indicative of a granular system. Tunneling measurements directly show that the effect of hydrogen loading is to induce a random insulator-superconductor phase separation, resulting in a percolative granularlike transition.

Original languageAmerican English
Pages (from-to)R15059-R15062
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number22
StatePublished - 1999


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