Superconductivity effect on electrical conduction in insulating granular films
Ju-Jin Kim, Jinhee Kim, Hu Jong Lee
DOI 10.1103/PhysRevB.46.11709 · Physical Review B
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Abstract
We report the temperature and magnetic-field dependence of electrical resistance of indium/indium-oxide (In/InOx) composite granular films in the insulating regime. The films show Mott variable-range hopping behavior at high temperatures, crossing over to a region of a much stronger temperature dependence of resistance near the superconducting transition temperature Tc of the grains. Below the crossover temperature the films show a large and negative magnetoresistance with a field dependence of ln[R(T,H)/R(T,0)]∝H2 in the low-field limit. We show that the temperature dependence of the zero-field resistance is well explained by a modified version of the conduction model for granular systems proposed by Adkins et al., which indicates that the crossover behavior of zero-field resistance is an effect of the grain superconductivity rather than the crossover from Mott to Efros-Shklovskii conduction. We also show that the magnetoresistance data can be explained quantitatively with the same model by taking into account the suppression of the gap in an external field.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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