Abstract
This paper is the first to demonstrate that a pure nonphonon mechanism can quantitatively explain all isotope effect experiments in YBaCuO (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 , T, pseudogap at , gap at 0 K, and number density of supercurrent carriers at 0 K. This paper points out that the observed inverse isotope effect of comes also from zero-point oscillation.
Highlights
Understanding the high-temperature superconductivity in cuprate superconductors is at the heart of current research in solid-state physics
This paper uses two local spin-mediated interaction (TLSMI) to explain quantitatively isotope effects and to give a series of predictions related to the isotope effect
From [6] and this paper, we know clearly that the mechanism in Section 2 for the high-Tc cuprates, that is, the TLSMI between two polaronic oxygen holes that causes the high-Tc superconductivity in YBCO, can explain many experimental findings including oxygen isotope effects of YBCO quantitatively
Summary
Understanding the high-temperature superconductivity in cuprate superconductors is at the heart of current research in solid-state physics. [3] proposes a t-J model including phonons, it cannot explain the isotope effect quantitatively. The first problem is that there is not a unified microscopic theory for both isotope effect and all other properties of the high-Tc cuprates. The second problem is that there is not a quantitative theory of the isotope effect, which is based on a pure electron mechanism. The two local spin-mediated interaction (TLSMI), which is a pure electron mechanism, of high-Tc cuprates was proposed in [18] and can explain most experiments except the isotope effect [6]. This paper uses TLSMI to explain quantitatively isotope effects and to give a series of predictions related to the isotope effect.
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