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

► Ab initio results show that electron-vibration coupling induces in SWBNT with diameter larger than 15 Å transition into anti-adiabatic ground state at distorted-fluxional geometry. ► Thermodynamic and magnetic properties of anti-adiabatic ground state imply possibility of bipolaronic superconductivity. ► Calculated critical temperature Tc of large diameter SWBNT is 39 K and inclusion of Mg into a tube increases Tc up to 70-90 K.