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|Title:||Experimental observation and simulation of unusual microwave response for the superconducting microstrip resonator at small dc magnetic field|
|Authors:||Ong, C.K. |
|Source:||Ong, C.K., Rao, X.S., Jin, B.B. (1999-11). Experimental observation and simulation of unusual microwave response for the superconducting microstrip resonator at small dc magnetic field. Superconductor Science and Technology 12 (11) : 827-829. ScholarBank@NUS Repository. https://doi.org/10.1088/0953-2048/12/11/340|
|Abstract:||An unusual microwave response of the surface impedance Zs of high-Tc thin films at an applied small dc magnetic field (Bdc) at 77 K, namely a decrease of Zs, is observed with the microstrip resonator technique. The resonant frequency is 1.107 GHz. The direction of Bdc is parallel or perpendicular to the a-b plane. Bdc ranges from 0 to 200 G. It is found that the surface resistance (Rs) at Bdc parallel to the a-b plane first decreases with Bdc and then increases above a crossover field. The Rs behaviour for Bdc perpendicular to the a-b plane is the same but with a different crossover field. The two behaviours can be collapsed to one curve by scaling the crossover fields. The changes of surface reactance Xs correlated linearly with the changes of Rs in the ranges of Bdc. The ratios rH of changes of Rs and Xs (rH = ΔRs/ΔXs) are 0.5 at Bdc less than the crossover field and 0.1 at Bdc greater than the crossover field. The measurements also show that the crossover field is independent of rf input power. A phenomenological model is also proposed to explain this unusual behaviour. By adjusting fitting parameters the computed results agree with the experimental results qualitatively.|
|Source Title:||Superconductor Science and Technology|
|Appears in Collections:||Staff Publications|
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