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Metal-insulator transition and superconductivity in boron-doped diamond
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2007 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, Vol. 75, no 165313Article in journal (Refereed) Published
Abstract [en]

We report on a detailed analysis of the transport properties and superconducting critical temperatures of boron-doped diamond films grown along the {100} direction. The system presents a metal-insulator transition (MIT) for a boron concentration (nB) on the order of nc~4.5×1020  cm−3, in excellent agreement with numerical calculations. The temperature dependence of the conductivity and Hall effect can be well described by variable range hopping for nB<nc with a characteristic hopping temperature T0 strongly reduced due to the proximity of the MIT. All metallic samples (i.e., for nB>nc) present a superconducting transition at low temperature. The zero-temperature conductivity 0 deduced from fits to the data above the critical temperature (Tc) using a classical quantum interference formula scales as 0(nB/nc−1) with ~1. Large Tc values (0.4  K) have been obtained for boron concentration down to nB/nc~1.1 and Tc surprisingly mimics a (nB/nc−1)1/2 law. Those high Tc values can be explained by a slow decrease of the electron-phonon coupling parameter and a corresponding drop of the Coulomb pseudopotential µ* as nBnc.

Place, publisher, year, edition, pages
2007. Vol. 75, no 165313
Keyword [en]
diamond, superconducting materials, boron, metal-insulator transition, Hall effect, hopping conduction, superconducting transitions, superconducting transition temperature, electron-phonon interactions, superconducting thin films
National Category
Natural Sciences
URN: urn:nbn:se:liu:diva-37883DOI: 10.1103/PhysRevB.75.165313Local ID: 40225OAI: diva2:258732
Original Publication: T. Klein, P. Achatz, J. Kacmarcik, C. Marcenat, F. Gustafsson, J. Marcus, E. Bustarret, J. Pernot, F. Omnes, Bo Sernelius, C. Persson, A. Ferreira da Silva and C. Cytermann, Metal-insulator transition and superconductivity in boron-doped diamond, 2007, Physical Review B. Condensed Matter and Materials Physics, (75), 165313. Copyright: American Physical Society Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2013-10-02

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