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Large diameter single-wall boron nanotubes (SWBNT) produced by2%Mg-mesoporous Al2O3 catalysis show diamagnetic transition at ~ 40 K and ~ 80K, which is a serious indication for possible superconductivity(J.Phys.Chem.C113, (2009) 17661). Theoretical study which explains or disprovespossibility of superconductivity in boron is so far absent, however. Here weapply first-principles formulation of nonadiabatic theory of electron-vibrationinteractions in study of band structure of boron nanotubes. The ab initioresults show that electron-vibration coupling induces in SWBNT with diameterlarger than 15 {\AA} transition into anti-adiabatic ground state atdistorted-fluxional geometry. Thermodynamic and magnetic properties ofanti-adiabatic ground state imply possibility of bipolaronic superconductivity.Calculated critical temperature Tc of large diameter SWBNT is 39 K andinclusion of Mg into a tube increases Tc up to 70-90 K. Presence of Al in SWBNTsuppress superconductivity and a tube remains metallic down to 0 K.Superconducting properties could established boron nanotubes superior materialfor nanotechnology.

journal of physics and chemistry of solids

Toward possibility of high-temperature bipolaronic superconductivity in  boron tubular polymorph: Theoretical aspects of transition into  anti-adiabatic state