Dresden 2003 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 8: Supraleitung: Dünne Schichten, Josephsonkontakte, SQUIDs
TT 8.1: Hauptvortrag
Dienstag, 25. März 2003, 09:30–10:00, HSZ304
Superconducting Quantum Interference Filters — •Jörg Oppenländer — Lehrstuhl fr Theoretische Festkörperphysik, Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen
Superconducting quantum interference filters (SQIFs) are multi-loop arrays of Josephson junctions possessing unconventional grating structures. For specially selected array loop size distributions the flux-to-voltage transfer function of SQIFs has a unique delta-peak like characteristics at zero applied flux. In contrast to conventional superconducting quantum interference devices (SQUIDs) which posses periodic flux-to-voltage transfer functions, the unique voltage response of SQIFs allows such devices to be directly employed as detectors of absolute strength of magnetic fields. The magnetic field resolution of SQIFs is comparable to or may be even better than that of conventional SQUIDs. In practice, SQIFs may have a number of significant advantages since their performance is not degraded by spreads in the Josephson junction parameters or deviations in the array loop sizes. This fault tolerance allows SQIFs to be realized in a relative simple way and has been used for the successful development of high performance low- and high-Tc SQIFs.