The Anomalous Unloaded Quality Factor Behavior of High T c Superconducting Microstrip Resonator in Weak dc Magnetic Field

Abstract

This paper reports the anomalous behavior of unloaded quality factor (Qu) of high Tc superconducting (HTSC) microstrip resonator in weak dc magnetic field (Bdc). The Qu behavior increases with the elevated applied Bdc, but beyond the certain Bdc value, decreases linearly with Bdc. We speculate that this behavior may be caused by edge effect. The behavior is modeled both by the coupled-grain model accounting for a distribution of the grain dimension and Coffey-Clem model.