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Metal-insulator transition and superconductivity in highly boron-doped nanocrystalline diamond films

Achatz, P., Bustarret, E., Marcenat, C., Piquerel, R., Dubouchet, T., Chapelier, C., Bonnot, A. M., Williams, Oliver Aneurin, Haenen, K., Gajewski, W., Garrido, J. A. and Stutzmann, M. 2009. Metal-insulator transition and superconductivity in highly boron-doped nanocrystalline diamond films. Physica Status Solidi a Applications and Materials Science 206 (9) , pp. 1978-1985. 10.1002/pssa.200982233

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The low temperature electronic transport of highly boron-doped nanocrystalline diamond films is studied down to 300 mK. The films show superconducting properties with critical temperatures Tc up to 2.1 K. The metal–insulator and superconducting transitions are driven by the dopant concentration and greatly influenced by the granularity in this system, as compared to highly boron-doped single crystal diamond. The critical boron concentration for the metal–insulator transition lies in the range from 2.3 × 1020 up to 2.9 × 1020 cm−3, as determined from transport measurements at low temperatures. Insulating nanocrystalline samples follow an Efros–Shklovskii (ES) type of temperature dependence for the conductivity up to room temperature, in contrast to Mott variable range hopping (VRH) in the case of insulating single crystal diamond close to the metal–insulator transition. The electronic transport in the metallic samples not only depends on the properties of the grains (highly boron-doped single crystal diamond), but also on the intergranular coupling between the grains. The Josephson coupling between the grains plays an important role for the superconductivity in this system, leading to a superconducting transition with global phase coherence at sufficiently low temperatures. Metallic nanocrystalline samples show similarities to highly boron-doped single crystal diamond. However, metallic samples close to the metal–insulator transition show a richer behavior. In particular, a peak was observed in the low-temperature magnetoresistance measurements for samples close to the transition, which can be explained by corrections to the conductance arising from superconducting fluctuations.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: Wiley
ISSN: 1862-6300
Last Modified: 04 Jun 2017 03:14

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