Percolative superconductor-to-insulator transition in Eu1.5Ce0.5NbSr2Cu2O10
Y. Levi, I. Felner, U. Asaf, O. Millo
DOI 10.1103/PhysRevB.60.R15059 · Physical Review B
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Eu1.5Ce0.5NbSr2Cu2O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29 | Pressure not reported | onset |
| Eu1.5Ce0.5NbSr2Cu2O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29 | Pressure not reported | onset |
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