Theory of Isotope Effect in YBa2Cu3O7−δ

Abstract EN

This paper is the first to demonstrate that a pure nonphonon mechanism can quantitatively explain all isotope effect experiments in YBa2Cu3O7−δ (YBCO) and to conclude that the influence of zero-point oscillation on the two local spin-mediated interaction (TLSMI) causes the isotope effects in YBCO.

This paper is the first to calculate the doping dependence of exponents of oxygen isotope effect for all quantities of YBCO, such as Tc, T*, pseudogap at Tc, gap at 0 K, and number density of supercurrent carriers at 0 K.

This paper points out that the observed inverse isotope effect of Tc comes also from zero-point oscillation.