Abstract
On the basis of new experimental studies of specific heat, magnetic properties and thermal expansion, it was shown that dielectric-metal phase transitions were the consequence of delocalization of the heavy holes located on metalapical oxygen bonds in the high-Tc oxide systems. The ordered arrays of such holes (CDW) results in the dielectric gaps in electron spectrum and anomalous negative thermal expansion. The free carriers introduced by doping can couple through excitations of these localized holes, (local bosons). The high-Tc superconductivity will possess anomalous Hc2(T) dependence and γ-type specific heat jump at Tc. This local bosons model is the basis for explanation of the obtained experimental data.
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Golovashkin, A.I., Anshukova, N.V., Ivanova, L.I. et al. Phase transition and superconductivity high-Tc oxides. Czech J Phys 46 (Suppl 3), 1191–1192 (1996). https://doi.org/10.1007/BF02562710
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DOI: https://doi.org/10.1007/BF02562710