Insulating state of granular superconductors in a strong-coupling regime
I.S. Beloborodov, Ya.V. Fominov, A.V. Lopatin, and V.M. Vinokur
TL;DR
This paper investigates how strong intergranular coupling and spatial variations in grain critical fields can induce an insulating state in 2D granular superconductors under magnetic fields, explaining giant magnetoresistance peaks.
Contribution
It introduces a model incorporating spatial variations of single-grain critical fields to explain the magnetic-field-induced insulating state in granular superconductors.
Findings
Insulating state appears in the model with spatial variations of critical fields.
The model explains the giant peak in magnetoresistance.
Strong intergranular coupling influences the insulating behavior.
Abstract
We analyze the possibility of the formation of a magnetic-field-induced insulating state in a two-dimensional granular superconductor with relatively strong intergranular coupling and show that such a state appears in a model with spatial variations of the single-grain critical magnetic field. This model describes realistic granular samples with the dispersion in grain sizes and explains the mechanism leading to a giant peak in the magnetoresistance.
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Taxonomy
TopicsHigh-pressure geophysics and materials · Geotechnical and Geomechanical Engineering · Physics of Superconductivity and Magnetism