2003/12/31 by Matteo Calandra, Nathalie Vast, Francesco Mauri · 2 citations
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Boron and Carbon Nanomaterials Research #High-pressure geophysics and materials #Superconductivity in MgB2 and Alloys #cond-mat.mtrl-sci #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.69.224505
5 pages, 5 figures, Band structure added
arxiv created 2004/04/06 · openalex publication_date 2004/06/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We propose an alternative route to achieve the superconducting state in boron-rich solids, the hole doping of B12 icosahedra. For this purpose we consider a prototype metallic phase of B13C2. We show that in this compound the boron icosahedral units are mainly responsible for the large phonon frequencies logarithmic average, 65.8\phantom\rule0.3em0exmeV, and the moderate electron-phonon coupling \ensuremathλ=0.81. We suggest that this high Tc could be a general feature of hole-doped boron icosahedral solids. Moreover our calculated moderate value of \ensuremathλ excludes the formation of bipolarons localized on the icosahedral length scale as suggested by previous authors.