The bulk Josephson responce of the d-g-wave cuprate superconductor

TL;DR

This paper investigates how the small Fermi surface in d-g-wave cuprate superconductors affects microwave absorption, revealing Josephson transitions between two condensates and explaining recent nonlinear absorption phenomena.

Contribution

It introduces a model linking small Fermi surface effects to Josephson transitions between d- and g-wave condensates in cuprates, explaining observed nonlinear microwave absorption.

Findings

Microwave absorption depends on field direction, amplitude, and frequency.

Josephson transitions between condensates cause nonlinear absorption effects.

Model aligns with recent experimental observations in YBaCu2O7−δ.

Abstract

We consider the implications of the small Fermi surface for the ab-plane microwave absorption. The small Fermi surface results in two superconducting condensates. Linear combinations of these condensates correspond to the d- and g-wave pairings. Microwave electric field applied in the ab-plane induces Josephson transitions between the condensates. Dependence of the absorption upon direction, amplitude and frequency of the external microwave field is calculated. Results of the calculation are compared with the observed recently novel non-linear phenomena in microwave absorption of $YBaCu_2O_{7-\delta}$ single crystals.