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absolute minimum adiabatic arbitrary atoms becomes less bottom changes sign compression region conduction band conduction electron Conductivity in Ideal Consequently considered CORNELL UNIVERSITY LIBRARY corresponding crystal deformation crystal density cubic curve DEIGEN and S. I. determined dielectric displacement drop easy to show effective mass effective radius elastic deformation elec electron conductivity electron is localized electron's wave function energetically equating estimate exceeds the lattice exist extremum field fixed follow the motion Formula 12 functional F given point Hence heteropolar ionic Ideal Homopolar Crystals incorrect increased inequality ionic crystals kinetic energy Landau large radii latter becomes lattice constant Let us assume limit linear mechanics medium method moduli nucleus obtain polarization polaron potential energy potential periodicity proportional respect to u^j Russian S. I. PEKAR self-consistent self-localized electron shown sketch small radii state-radius Substi take into account takes negative values tends to zero tensor Teor theory tuting valid variation varying