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John MorelandNational Bureau of Standards, Electromagnetic Technology Division, Boulder, Colorado 80303J. W. EkinNational Bureau of Standards, Electromagnetic Technology Division, Boulder, Colorado 80303L.F. GoodrichNational Bureau of Standards, Electromagnetic Technology Division, Boulder, Colorado 80303T. E. CapobiancoNational Bureau of Standards, Electromagnetic Technology Division, Boulder, Colorado 80303A. F. ClarkNational Bureau of Standards, Electromagnetic Technology Division, Boulder, Colorado 80303J. KwoNational Bureau of Standards, Electromagnetic Technology Division, Boulder, Colorado 80303M. HongNational Bureau of Standards, Electromagnetic Technology Division, Boulder, Colorado 80303S. H. LiouNational Bureau of Standards, Electromagnetic Technology Division, Boulder, Colorado 80303
1987lv
ABI
Abstract
Current-voltage tunneling characteristics in a high-critical-temperature superconducting material containing predominately ${\mathrm{Y}}_{1}$${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{9\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ have been measured using the break-junction technique. Sharp gap structure was observed, with the largest superconductive energy gap measured to be \ensuremath{\Delta}=19.5\ifmmode\pm\else\textpm\fi{}1 meV, assuming a superconductor-insulator-superconductor junction. This energy gap corresponds to 2\ensuremath{\Delta}/${k}_{B}$${T}_{c}$=4.8 at T=4 K, for a critical temperature of 93 K (midpoint of the resistive transition).
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Cited by 20 references