Towards the Theory of Isotope Effect of the London Penetration Depth in Cuprates

TL;DR

This paper investigates the isotope effect on the London penetration depth in cuprates by analyzing superfluid density through weak and strong coupling models, supported by numerical calculations aligned with experimental data.

Contribution

It provides a theoretical framework for understanding the isotope effect on the London penetration depth in high-Tc cuprates, incorporating realistic band structures and Fermi surfaces.

Findings

Numerical results match experimental isotope dependencies.

Both weak and strong coupling approaches are discussed.

Fermi surface data are integrated into the analysis.

Abstract

The expressions for the superfluid density have been discussed in both weak and strong coupling approaches. The numerical calculations of temperature and isotope composition dependencies have been performed for a number of High-Tc compounds. The tight-binding parameters and corresponding Fermi surfaces are taken in accord to the available photoemission data.