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A Comparative Study of Nonlinear Microwave Properties in {\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{7} , TlBaCaCuO and HgBaCaCuO Microstrip Resonators

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3 Author(s)
Lu Ji ; Dept. of Electron., Nankai Univ., Tianjin, China ; Shaolin Yan ; Wu, Judy Z.

Microwave nonlinearity is investigated in several high-temperature superconductors (HTS) including YBa2Cu3O7, TlBa2CaCu2O7, Tl2Ba2CaCu2O8 , TlBa2Ca2Cu3O9 and HgBa2CaCu2O6+delta microstrip resonators. The critical power P c, above which nonlinearity becomes a serious concern, was compared with the dc critical current density J c at temperatures above 77 K. When plotted at the real temperature scale, Pc and J c for each HTS system follow a similar trend near T c, indicating that a similar mechanism of magnetic pinning limits both P c and J c. This result suggests that a better Pc may be achieved in HTS films of enhanced magnetic pinning.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:19 ,  Issue: 3 )