It has been shown that el-ph coupling to Ag, B2g and B3g modes in Y Ba2Cu3O7 induces T-dependent electronic structure instability which is related to fluctuation of analytic critical point of (d-pσ) band across Fermi level. It results in considerable reduction of chemical potential and to breakdown of the Born-Oppenheimer approximation. At critical temperature Tc, superconducting system undergoes transition from adiabatic electronic ground state into anti-adiabatic state at broken symmetry that is stabilized due to the effect of nuclear dynamics. This effect is absent in non-superconducting YBa2Cu3O6. Formation of asymmetric gaps in a and b direction of Y Ba2Cu3O7 has been shown. In a good agreement with experimental Tc of superconducting state transition, critical temperature has been calculated - Tc ≈ 92.8 K. Present study has also revealed that in c direction there should be identified the next gap that is considerably smaller than gaps in a, b directions.
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BaŇAckÝ, P. (2008). Antiadiabatic State – Ground State Of Superconductors: Study Of Ybco. In: Bonča, J., Kruchinin, S. (eds) Electron Transport in Nanosystems. NATO Science for Peace and Security Series B: Physics and Biophysics. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9146-9_15
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