The oxygen isotope effect on critical temperature in superconducting copper oxides

TL;DR

This paper investigates the oxygen isotope effect in cuprate superconductors and finds it consistent with the bisoliton theory, highlighting its doping-dependent peculiarities and contributing to understanding unconventional superconductivity.

Contribution

It demonstrates that the oxygen isotope effect in cuprates aligns with the bisoliton theory, offering new insights into the mechanism of unconventional superconductivity.

Findings

Oxygen isotope effect varies strongly with doping level.

The isotope effect in cuprates agrees with the bisoliton theory.

Provides evidence supporting the bisoliton model for superconductivity.

Abstract

The isotope effect provided a crucial key to the development of the BCS (Bardeen-Cooper-Schrieffer) microscopic theory of superconductivity for conventional superconductors. In superconducting cooper oxides (cuprates) showing an unconventional type of superconductivity, the oxygen isotope effect is very peculiar: the exponential coefficient strongly depends on doping level. No consensus has been reached so far on the origin of the isotope effect in the cuprates. Here we show that the oxygen isotope effect in cuprates is in agreement with the bisoliton theory of superconductivity.