Theoretical investigation of superconductivity in diamond - Effects of doping and pressure
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2021-01-28 |
| Journal | Journal of Applied Physics |
| Authors | FƔbio J. R. Costa, J. S. de Almeida |
| Institutions | Universidade Federal da Bahia |
| Citations | 9 |
Abstract
Section titled āAbstractāThe electronic structure, lattice dynamics, and electron-phonon coupling of pure, boron and nitrogen-doped diamond carbon were investigated using first-principle calculations within the generalized-gradient and virtual crystal approximations. To examine the influence of the impurity content and pressure on the superconductivity of these systems, the electron-phonon coupling constant (Ī») and the critical temperature (Tc) were calculated as a function of concentrations from 0 to 15% and pressures from 0 to 90 GPa. Regarding the boron-doped diamond, calculations indicated that its electron-phonon coupling strongly relates to the optical phonon modes, and the estimated critical temperatures matched previous theoretical and experimental results. Regarding the nitrogen-doped case, it was observed that both Ī» and Tc were larger than those obtained for the hole-doped case. The most distinguishing feature of this system was its rising acoustic contribution to the electron-phonon coupling, which led to significant values for Ī» and Tc. The majority of the scenarios investigated here presented a decreasing critical temperature with increasing pressure. In contrast to the other cases, C0.85N0.15 exhibited a positive dependence between Tc and pressure leading to a superconducting transition temperature of about 122 K at 20 GPa.
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal SourceāReferences
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