Abstract
Using many body quantum dynamical approach and the most versatile double time thermodynamic phonon Green’s function technique, the effects of isotopic point impurities on phonon density of states (PDOS) and phonon heat capacity (PHC) of representative cuprate high temperature superconductor (HTS) YBa2Cu3O7-δ has been investigated. It is found that the PHC can be resolved into diagonal and non-diagonal contributions, which are significantly influenced by defects. The numerical investigation of defect contribution to PHC of high temperature cuprate superconductor (HTS) YBa2Cu3O7-δ signifies their influence along with temperature dependence via various distribution functions.
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