Photoinduced superconducting nanowires in Gd-Ba-Cu-O films

TL;DR

This paper demonstrates the fabrication of high-temperature superconducting nanowires in Gd-Ba-Cu-O films through photodoping using an optical near-field probe, enabling localized superconductivity at room temperature.

Contribution

It introduces a novel photodoping technique with an optical near-field probe to create superconducting nanowires in Gd-Ba-Cu-O films at room temperature.

Findings

Nanowires are approximately 250 nm wide.

Photogenerated electrons create confining potentials for holes.

Electron diffusion influences wire width.

Abstract

We report the fabrication of high Tc superconducting wires by photodoping a GdBa2Cu3O{6.5} thin film. An optical near-field probe was used to locally excite carriers in the system at room temperature. Trapping of the photogenerated electrons define a confining potential for the conducting holes in the CuO planes. Spatially resolved reflectance measurements show the photogenerated nanowires to be ~ 250 nm wide. Electron diffusion, before electron capture, is believed to be responsible for the observed width of the wires.