2004/04/30 by K. -W. Lee, Kwan-Woo Lee, W. E. Pickett +1 · 2 citations
Materials Science · Physics and Astronomy · #Boron and Carbon Nanomaterials Research #Diamond and Carbon-based Materials Research #Superconductivity in MgB2 and Alloys #cond-mat.mtrl-sci #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.93.237003
published as Phys. Rev. Lett. 93, 237003 (2004) · Four pages with two embedded figures, corrected fig1. (To appear in Physical Review Letters(2004))
arxiv created 2004/10/14 · openalex publication_date 2004/11/30 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
Superconductivity of boron-doped diamond, reported recently at Tc=4 K, is investigated exploiting its electronic and vibrational analogies to MgB2. The deformation potential of the hole states arising from the C-C bond-stretch mode is 60% larger than the corresponding quantity in MgB2 that drives its high Tc, leading to very large electron-phonon matrix elements. The calculated coupling strength \ensuremathλ\ensuremath≈0.5 leads to Tc in the 5--10 K range and makes phonon coupling the likely mechanism. Higher doping should increase Tc somewhat, but the effects of three dimensionality primarily on the density of states keep doped diamond from having a Tc closer to that of MgB2.