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Title: Investigation of the effect of thermal cycling on the device performance of YBa2Cu3O7-? DC-SQUIDs
Authors: Avcı, İlbeyi
Algül, B. P.
Bozbey, Ali
Akram, R.
Tepe, Mustafa
Abukay, Doğan
Keywords: Yttrium barium copper oxides
Protective layers
DC-magnetron sputtering
Critical currents
Publisher: IOP Publishing Ltd.
Source: Avcı, İ., Algül, B. P., Bozbey, A., Akram, R., Tepe, M., and Abukay, D. (2007). Investigation of the effect of thermal cycling on the device performance of YBa2Cu3O7-δ DC-SQUIDs. Superconductor Science and Technology, 20(10), 944-949. doi:10.1088/0953-2048/20/10/008
Abstract: We investigated the effect of thermal cycling on the operational performance of YBa2Cu3O7-δ (YBCO) direct current superconducting quantum interference devices (DC-SQUIDs) fabricated onto 24°SrTiO3 (STO) bicrystal substrates. The devices under investigation consist of directly coupled DC-SQUID magnetometer configurations. Thin films having 200nm thicknesses were deposited by dc-magnetron sputtering and device patterns were made by a standard lithography process and chemical etching. The SQUIDs having 4νm-wide grain boundary Josephson junctions (GBJJs) were characterized by means of critical currents, peak-to-peak output voltages and noise levels, depending on the thermal cycles. In order to achieve a protective layer for the junctions against the undesired effects of thermal cycles and ambient atmosphere during the room temperature storage, the devices were coated with a 400nm thick YBCO layer at room temperature. Since the second layer of amorphous YBCO is completely electrically insulating, it does not affect the operation of the junctions and pick-up coils of magnetometers. This two-layered configuration ensures the protection of the junctions from ambient atmosphere as well as from the effect of water molecules interacting with the film structure during each thermal cycle.
ISSN: 0953-2048
Appears in Collections:Physics / Fizik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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