Suppression of superconductivity in granular metals

Abstract

We investigate the suppression of the superconducting transition temperature due to Coulomb repulsion in granular metallic systems at large tunneling conductance between the grains, $g_T\gg 1$. We find the correction to the superconducting transition temperature for 3$D$ granular samples and films. We demonstrate that depending on the parameters of superconducting grains, the corresponding granular samples can be divided into two groups: (i) the granular samples that belong to the first group may have only insulating or superconducting states at zero temperature depending on the bare intergranular tunneling conductance $g_T$, while (ii) the granular samples that belong to the second group in addition have an intermediate metallic phase where superconductivity is suppressed while the effects of the Coulomb blockade are not yet strong.

arXiv comment4 pages, 3 figures

References in corpus (6)

• Coulomb effects in granular materials at not very low temperatures
• Transport properties of granular metals at low temperatures
• Negative Magnetoresistance of Granular Metals in a Strong Magnetic Field
• Transition from insulating to a non-insulating temperature dependence of the conductivity in granular metals
• Quantum interference and Coulomb interaction in arrays of tunnel junctions
• On the possibility of a metallic phase in granular superconducting films

Cited by in corpus (7)

• Granular Electronic Systems
• Weak localization correction to the anomalous Hall effect in polycrystalline Fe films
• Two-Fluid Model for Granular Superconductors
• Collapse of the Cooper pair phase coherence length at a superconductor to insulator transition
• Effects of fluctuations and Coulomb interaction on the transition temperature of granular superconductors
• Effects of Rashba-spin-orbit coupling on superconducting boron-doped nanocrystalline diamond films: evidence of interfacial triplet superconductivity
• Superconductivity in im-miscible Cu-Nb phase separated nano-composite thin films