Nanoscale Proximity Effect in the High Temperature Superconductor Bi-2212

TL;DR

This study uses scanning tunneling microscopy to reveal that nanoscale regions with weak superconductivity in Bi-2212 can persist at higher temperatures if adjacent to strongly superconducting areas, implying dopant distribution control could enhance transition temperatures.

Contribution

It demonstrates the influence of nanoscale inhomogeneity on superconductivity in Bi-2212 and suggests dopant engineering as a route to higher transition temperatures.

Findings

Weak superconducting regions can survive at elevated temperatures near strong regions.

Nanoscale inhomogeneity affects local superconducting properties.

Controlling dopant distribution may increase maximum transition temperature.

Abstract

High temperature cuprate superconductors exhibit extremely local nanoscale phenomena and strong sensitivity to doping. While other experiments have looked at nanoscale interfaces between layers of different dopings, we focus on the interplay between naturally inhomogeneous nanoscale regions. Using scanning tunneling microscopy to carefully track the same region of the sample as a function of temperature, we show that regions with weak superconductivity can persist to elevated temperatures if bordered by regions of strong superconductivity. This suggests that it may be possible to increase the maximum possible transition temperature by controlling the distribution of dopants.