Fantastic Behavior of High-TC Superconductor Junctions: Tunable Superconductivity

TL;DR

This paper reports a novel method to tune the superconducting transition temperature in YBCO high-Tc superconductor junctions via carrier injection, revealing a new functional control mechanism for superconducting devices.

Contribution

It introduces the first observation of tunable superconductivity in high-Tc YBCO junctions through electric processes, expanding the functional capabilities of superconductor-based devices.

Findings

Superconducting transition temperature increased by over 20 K.

Carrier injection caused resistance changes distinct from semiconductors.

Proposed models explain the tunable behavior based on charge trapping and BCS theory.

Abstract

Carrier injection performed in oxygen-deficient YBa2Cu3O7(YBCO) hetero-structure junctions exhibited tunable resistance that was entirely different with behaviors of semiconductor devices. Tunable superconductivity in YBCO junctions, increasing over 20 K in transition temperature, has achieved by using electric processes. To our knowledge, this is the first observation that intrinsic property of high TC superconductors superconductivity can be adjusted as tunable functional parameters of devices. The fantastic phenomenon caused by carrier injection was discussed based on a proposed charge carrier self-trapping model and BCS theory.