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Title: Comparison of intrinsic Josephson and SIS tunneling spectroscopy of Bi 2Sr2CaCu2O8+?
Authors: Özyüzer, Lütfi
Kurter, Cihan
Zasadzinski, John F.
Gray, Kenneth E.
Hinks, David G.
Miyakawa, Nobuaki
Keywords: High-Tc superconductors
Intrinsic Josephson junctions
Spectroscopic analysis
Tunneling spectroscopy
Issue Date: May-2005
Publisher: IEEE
Source: Özyüzer, L., Kurter, C., Zasadzinski, J.F., Gray, K.E., Hinks, D.G., and Miyakawa, N. (2005). Comparison of intrinsic Josephson and SIS tunneling spectroscopy of Bi 2Sr2CaCu2O8+δ. IEEE Transactions on Applied Superconductivity, 15(2 PART I), 181-184. doi:10.1109/TASC.2005.849743
Abstract: Tunneling spectroscopy measurements are reported on optimally-doped and overdoped Bi2Sr2Ca2Cu2O 8+δ single crystals. A novel point contact method is used to obtain superconductor-insulator-normal metal (SIN) and SIS break junctions as well as intrinsic Josephson junctions (IJJ) from nanoscale crystals. Three junction types are obtained on the same crystal to compare the quasiparticle peaks and higher bias dip/hump structures which have also been found in other surface probes such as scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy. However, our IJJ quasiparticle spectra consistently reveal very sharp conductance peaks and no higher bias dip structures. The IJJ conductance peak voltage divided by the number of junctions in the stack consistently leads to a significant underestimate of Δ when compared to the single junction values. The comparison of the three methods suggests that the markedly different characteristics of IJJ are a consequence of nonequilibrium effects and are not intrinsic quasiparticle features.
ISSN: 1051-8223
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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