Study of microwave surface resistance of type‐II superconductors carrying transport current

Abstract

We investigate the microwave surface resistance of an infinitely long type-II superconductor in the critical state carrying transport DC current, in the absence and in the presence of external magnetic fields. Calculations include both different cooling processes and various current and field arrangements.Theoretical results in field-cooled sample show that the microwave surface resistance exhibits an initial slow variation followed by a faster one above a threshold current value. This occurs when the current induced magnetic field generates fluxons of opposite directions on the two sample edges.

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“…[16] Furthermore, models for R s in type-II superconductor were also constructed. [17] However, systematic investigations of the microwave characteristics are still needed to improve the applicability of superconducting microwave components for future technologies.…”