Probing the phase diagram of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+delta} with tunneling spectroscopy.

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Tunneling measurements are performed on Ca-rich single crystals of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} (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 quasi-particle 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 slightly smaller optimum T{sub c} and therefore smaller gap values for any doping level. The evolution ... continued below

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4 pages

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Ozyuzer, L.; Zasadzinski, J. F.; Gray, K. E.; Hinks, D. G. & Miyakawa, N. August 29, 2002.

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Tunneling measurements are performed on Ca-rich single crystals of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} (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 quasi-particle 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 slightly smaller optimum T{sub c} 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.

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4 pages

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  • Applied Superconductivity Conference and Expo (ASC 2002), Houston, TX (US), 08/04/2002--08/09/2002

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  • Report No.: ANL/MSD/CP-108549
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 801592
  • Archival Resource Key: ark:/67531/metadc736496

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  • August 29, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • March 30, 2016, 5:55 p.m.

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Ozyuzer, L.; Zasadzinski, J. F.; Gray, K. E.; Hinks, D. G. & Miyakawa, N. Probing the phase diagram of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+delta} with tunneling spectroscopy., article, August 29, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc736496/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.