Charge Imbalance in a Layered Structure of High Temperature Superconductors

TL;DR

This paper investigates how charge imbalance caused by quasiparticle injection affects the electrical behavior of layered high-temperature superconductor structures, focusing on non-stationary effects in intrinsic Josephson junction stacks.

Contribution

It provides a detailed analysis of non-stationary charge imbalance effects on IVC and voltage dynamics in layered superconductor junction stacks, a topic with limited prior exploration.

Findings

Charge imbalance influences the IVC in layered superconductors.

Time-dependent voltage and quasiparticle potential are affected by charge imbalance.

Results help in understanding quasiparticle dynamics in superconductor devices.

Abstract

Quasiparticle injection devices are considered as one of the candidates for the high temperature superconductor transistors, which can operate at liquid nitrogen temperatures. In these devices the nonequilibrium effects are created by injecting quasiparticle current into a stack of intrinsic Josephson junctions (IJJs). These effects lead to an occurrence of a shift of the condensate chemical potential and a difference in the distribution between the electron-like and the hole-like quasiparticles that causes a charge imbalance. Such effects are observed in many experiments for both bulk and layered superconductors. In this paper, we study non-stationary nonequilibrium charge imbalance effect due to current injection in a stack of IJJs. We investigate the effect of the charge imbalance on the current-voltage characteristic (IVC) and the time dependence of the voltage and the quasiparticle potential in a stack of five IJJs.