SUPERCONDUCTIVITY EFFECT ON ELECTRICAL-CONDUCTION IN INSULATING GRANULAR FILMS
SCIE
SCOPUS
- Title
- SUPERCONDUCTIVITY EFFECT ON ELECTRICAL-CONDUCTION IN INSULATING GRANULAR FILMS
- Authors
- KIM, JH; KIM, JJ; LEE, HJ
- Date Issued
- 1992-11-01
- Publisher
- AMERICAN PHYSICAL SOC
- 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 T(c) 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)] is-proportional-to H-2 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/11963
- DOI
- 10.1103/PhysRevB.46.11709
- ISSN
- 1098-0121
- Article Type
- Article
- Citation
- PHYSICAL REVIEW B, vol. 46, no. 18, page. 11709 - 11713, 1992-11-01
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