Implications of the isotope effects on the magnetization, magnetic torque and susceptibility

TL;DR

This paper investigates how isotope effects influence the magnetic properties of cuprate superconductors near the critical temperature, revealing that isotope effects on Tc are linked to changes in anisotropy and carrier concentration.

Contribution

It demonstrates that isotope effects on critical properties are connected to anisotropy changes and carrier concentration variations in cuprate superconductors.

Findings

Isotope effects on Tc mirror those on anisotropy.

Doping dependence of isotope effects is traced to carrier concentration changes.

Universal 3D-XY scaling relations describe the data.

Abstract

We analyze the magnetization, magnetic torque and susceptibility data of La2-xSrxCu(16,18)O4 and YBa2(63,65)CuO7-x near Tc in terms of the universal 3D-XY scaling relations. It is shown that the isotope effect on Tc mirrors that on the anisotropy. Invoking the generic behavior of the anisotropy the doping dependence of the isotope effects on the critical properties, including Tc, correlation lengths and magnetic penetration depths are traced back to a change of the mobile carrier concentration.