Abstract
In order to examine possibility of persistent current switch using oxide superconductor and laser trigger, voltage response to argon-ion laser pulse was investigated in Bi-based bulk and Y-based thin film specimens immersed in liquid nitrogen. When laser pulse is applied to a bulk specimen under constant current flow, voltage rise is observed. Voltage rise increases with laser intensity and current. Relationship between voltage rise due to laser pulse and electric field due to flux flow before laser irradiation shows almost the same straight line in six specimens. In the thin film specimen, voltage response is pulse like and large in comparison with the bulk specimen. Time-integrated value of voltage response increases with laser intensity and with current; the same tendency with bulk specimen is observed. Voltage response is delayed from laser pulse. Delay time decreases with laser intensity.
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