2003/02/03 by V. N. Bogomolov, Bogomolov, V. N.
Chemistry · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Advanced Thermodynamics and Statistical Mechanics #FOS: Physical sciences #Quantum, superfluid, helium dynamics #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0302034
3 pages, RevTeX4
arxiv created 2003/02/03 · openalex publication_date 2003/02/03 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The paper discusses a model of Van der Waals crystals in which band-gap structures do not form. An effect of strong and chaotic electron-electron repulsion, which was excluded from consideration in the traditional approach, is taken into account. A condensate exists as a result of a dynamic equilibrium among atoms acted upon by constant Van der Waals forces and periodically forming and disappearing covalent bonding. One part of atoms is, on the average, in the ground, and the other, in excited state, to form diatomic virtual molecules. Treated in terms of this pseudoclassical model, the interatomic distances, binding energies, volumes, and pressures at which metallization, for instance, of inert gases and hydrogen, sets in is described by simple relations involving only two spectroscopic parameters of atoms (molecules). Applying pressure to a VdW crystals transfers it from the insulator first to a Bose superconductor, and after that, to a Fermi metal. An empirical relation Tc ∼ N2/3 between the superconductivity transition temperature Tc and the particles concentration N in chalcogens under pressure is considered as an example of such situation.