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Title: Fabrication of array of mesas on superconducting Bi2Sr 2CaCu2O8+? single crystals
Authors: Kurter, Cihan
Özyüzer, Lütfi
Keywords: Atomic force microscopy
High temperature superconductors
Intrinsic Josephson junctions
Tunneling spectroscopy
Issue Date: Feb-2005
Publisher: National Institute of Optoelectronics
Source: Kurter, C., and Özyüzer, L. (2005). Fabrication of array of mesas on superconducting Bi2Sr 2CaCu2O8+δ single crystals. Journal of Optoelectronics and Advanced Materials, 7(1), 415-418.
Abstract: The superconducting properties of multi-layered high temperature superconductors (HTS) result mainly from the CuO2 planes, while the other structural components behave simply as charge reservoirs. Using these perfect-layered structures of HTS, arrays of mesas have been fabricated on the surfaces of Bi2Sr2CaCu2O8+δ (Bi2212) single crystals using hotolithography and argon ion beam etching techniques. These arrays have current-voltage (I-V) characteristics that consist of some branches corresponding to different intrinsic Josephson junctions in the mesas, The surface topography and heights of the mesas were examined with atomic force microscopy. Due to the small mesa area, conventional wire bonding techniques are not applicable. A novel method, point contact tunneling apparatus with a sharp Au tip, was used to obtain the I-V characteristics of the fabricated intrinsic Josephson junctions, below the critical temperature of Bi2212. Since the ultimate goal was to obtain an ordered group of mesas with small lateral dimensions, to eliminate heating effects during I-V measurements, we showed that submicron-sized mesas could be characterized by the new technique.
ISSN: 1454-4164
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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