Direct Observation of Phase Oscillation Modes in Josephson-coupled Layered Superconductors

TL;DR

This paper demonstrates a microwave S parameters method to directly observe phase oscillation modes in layered superconductors, revealing discrete modes below the plasma frequency, which could advance understanding of Josephson coupling.

Contribution

First direct measurement of phase oscillation modes in layered superconductors using microwave S parameters at 77 K, providing new insights into Josephson coupling phenomena.

Findings

Discrete phase oscillation modes observed below plasma frequency

Method successfully applied to SmBCO and YBCO superconductors

Potential for a powerful tool in superconductor research

Abstract

We have proposed to employ the microwave S parameters method to measure phase oscillation modes (POMs) in Josephson coupled-layered superconductors. For the first time, in SmBa2Cu3O7 (SmBCO) and YBa2Cu3O7-b (YBCO) at 77 K we have directly observed some POMs far below the Josephson plasma frequency. A series of discrete modes have been observed and discussed qualitatively in the POMs. The method may be a powerful and flexible tool in this field.