Superconductivity effects near the metal-insulator transition in granular indium films
The paper reports on an investigation of the electric resistance as a function of temperature T, magnetic field H, and applied voltage V in granular indium films when approaching the metal-insulator transition (MIT) due to increased thickness of the oxide layers between granules. The dependences are shown to be governed at T less than or equal to 5 K by competition of the hopping conductivity and the Josephson tunneling of electrons, sometimes giving rise to a resistance minimum in R(T) associated with superconductivity. It was also found that even when the intergranular Josephson tunneling is totally suppressed, transition of granules to the superconducting state influences essentially the dependences R(T,H), changing the functional form of R(T) and resulting in anomalously high negative magnetoresistance. This is shown to stem from the change of the character of activated electron tunneling as the granules become superconducting.
- Research Organization:
- Institute for Low Temperature Physics and Engineering, Kharkov, USSR
- OSTI ID:
- 5741965
- Journal Information:
- J. Low Temp. Phys.; (United States), Vol. 69:5-6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
INDIUM
MAGNETORESISTANCE
SUPERCONDUCTIVITY
TRANSITION TEMPERATURE
TUNNEL EFFECT
ELECTRON TRANSFER
ELECTRONS
INDIUM OXIDES
JOSEPHSON JUNCTIONS
MAGNETIC FIELDS
SUPERCONDUCTING FILMS
THIN FILMS
ULTRALOW TEMPERATURE
CHALCOGENIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
FILMS
INDIUM COMPOUNDS
JUNCTIONS
LEPTONS
METALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTING JUNCTIONS
THERMODYNAMIC PROPERTIES
360104* - Metals & Alloys- Physical Properties
420201 - Engineering- Cryogenic Equipment & Devices