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Title: Probing the phase diagram of Bi2Sr2CaCu 2O8+? with tunneling spectroscopy
Authors: Özyüzer, Lütfi
Zasadzinski, John F.
Gray, Kenneth E.
Hinks, David G.
Miyakawa, Nobuaki
Keywords: Oxide superconductors
Tunneling conductance
High temperature superconductors
Josephson junctions
Issue Date: Jun-2003
Publisher: Institute of Electrical and Electronics Engineers Inc.
Source: Özyüzer, L., Zasadzinski, J. F., Gray, K. E., Hinks, D. G., and Miyakawa, N. (2003). Probing the phase diagram of Bi2Sr2CaCu 2O8+δ with tunneling spectroscopy. IEEE Transactions on Applied Superconductivity, 13(2), 893-896. doi:10.1109/TASC.2003.814072
Abstract: Tunneling measurements are performed on Ca-rich single crystals of Bi 2Sr2CaCu2O8+δ (Bi2212), with various oxygen doping levels, using a novel point contact method. At 4.2 K, SIN and SIS tunnel junctions are obtained with well-defined quasiparticle peaks, robust dip and hump features and in some cases Josephson currents. The doping dependence of tunneling conductances of Ca-rich Bi2212 are analyzed and compared to stoichiometric Bi2212. A similar profile of energy gap vs. doping concentration is found although the Ca-rich samples have a slighly smaller optimum Tc and therefore smaller gap values for any doping level. The evolution of tunneling conductance peak height to background ratios with hole concentration are compared. For a given doping level, the Ca-rich spectra showed more broadened features compared to the stoichiometric counterparts, most likely due to increased disorder from the excess Ca. Comparison of the dip and hump features has provided some potential insights into their origins.
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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