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$Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction$

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Low-temperature phenomena in highly doped grained diamond.

J J Mares¹, P Hubík, J Kristofik

¹Institute of Physics ASCR v. v. i., Cukrovarnická 10, 162 53 Prague 6, Czech Republic.

Journal of Nanoscience and Nanotechnology

|June 10, 2009

Summary

Highly boron-doped nanocrystalline diamond films exhibit low-temperature phenomena. A model of superconducting grains with nanoscale weak links explains critical currents and Josephson

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Low-temperature phenomena in advanced materials are crucial for technological applications.
Nanocrystalline diamond films offer unique electronic properties.
Understanding superconductivity in doped diamond is an active research area.

Purpose of the Study:

Investigate low-temperature phenomena in highly boron-doped nanocrystalline diamond.
Analyze the impact of granular structure on superconducting properties.
Explain experimental observations using a theoretical model.

Main Methods:

Plasma enhanced chemical vapour deposition (PECVD) for film growth.
Experimental measurements of critical currents and noise characteristics.
Modeling of superconducting grains with nanoscale weak links.

Main Results:

Observed critical currents consistent with the proposed model.
Supercurrents induced by thermal noise explained by grain-link structure.
Current-induced Josephson's noise characterized within the superconductivity transition.

Conclusions:

The granular structure significantly influences superconducting behavior.
A model of superconducting grains interconnected by nanoscale weak links accurately describes experimental data.
This work provides insights into superconductivity mechanisms in doped nanocrystalline diamond.