Doping dependence of the critical current in Bi2Sr2CaCu2Oy

TL;DR

This study investigates how the critical current density in Bi2Sr2CaCu2Oy thin films varies with doping, revealing a non-trivial doping dependence with a maximum in the overdoped regime.

Contribution

It provides detailed measurements of the doping dependence of critical current density and its temperature behavior in high-quality Bi2Sr2CaCu2Oy thin films.

Findings

Critical current at zero temperature peaks at a specific overdoped level.

All samples share the same temperature dependence of $J_c$.

Critical current density varies non-trivially with doping.

Abstract

The doping dependence of the critical current density, $J_{c}$, was measured in a series of high quality c-axis oriented ${\rm Bi_2Sr_2CaCu_2O_{8+\delta}}$ thin films. For each doping level we measured the temperature dependence of $J_{c}$. We find that all samples have the same temperature dependence, but the critical current at zero temperature, $J_{c}(0)$, has a non-trivial doping dependence with a maximum at a unique doping level in the overdoped side of the superconducting dome.