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Fabrication and characterization of high-Tc SQUID magnetometer with damping resistance

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6 Author(s)
M. Matsuda ; Muroran Inst. of Technol., Hokkaido, Japan ; T. Otowa ; T. Matsuura ; S. Kuriki
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Effects of damping resistance on current versus voltage (I-V) characteristics for high-Tc superconducting quantum interference devices (SQUIDs) were studied. In the transverse-type SQUID with coplanar strip lines, parasitic capacitance originating from the large dielectric constant of SrTiO3 substrates can induce resonance structures on I-V curves and degrade the modulation voltage. In our simulations, it is shown that the modulation voltage is much improved by using damping resistance. However, the obtained experimental results for our SQUIDs with Au damping do not agree well with those in the simulations. The discrepancy is likely due to existence of the large contact resistance between Au and YBa2Cu3O7-δ films.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:13 ,  Issue: 2 )