The microwave power handling of a FIB generated weak link in a YBCO film

Details The microwave power handling of a FIB generated weak link in a YBCO film The microwave power handling of a FIB generated weak link in a YBCO film

1999-02-08

arxiv.org/abs/cond-mat/9902095v2

Physics

Condensed Matter

Superconductivity

10 pages (with figures included), 6 figures, LaTeX2e, revised Mar 1999, accepted for publication by: Supercond. Sci. Technol

Scientific paper

10.1088/0953-2048/12/7/305

We have measured the power dependent microwave properties of a weak link in a YBa2Cu3O7 thin film formed by writing a line of damage using a focused ion beam. The measurement was made using a parallel plate resonator at 5.5 GHz with the weak link written across the width of one of the plates. The ion induced damage was characterized using a TRIM computer simulation and the dc properties of similar weak links was measured. Using a 200 eV Si ion dose of 2e13 cm-2, the Tc of the damaged region was reduced by 5.5 K and the normal resistivity was doubled. Surprisingly, the microwave measurements did not show any Josephson junction characteristics. Rather, the ion damaged region exhibited a greatly increased microwave resistivity that was constant as a function of microwave power up to rf fields of 20 mT at 21 K.

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