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VOLUME 73 (2001) | ISSUE 3 | PAGE 159
Superconducting energy gap in Bi2Sr2Ca2Cu3O10+δ (Bi2223) single crystals
PACS: 74.50.+r, 74.72.Hs
Abstract
Current-voltage characteristics of S-I-S tunnel break junctions fabricated from pure undoped Bi2223 single crystals (Tc=110 K) have been measured. High quality of the crystals enables to produce the good tunnel junctions with a low or almost zero leakage current and well developed the gap structure in the tunneling spectra. Values of the peak-to-peak energy gap  2Δ p-p in different crystals and tunnel junctions ranged from 80 to 105 meV. The tunneling conductance in superconducting state was normalized by that in normal state and compared to a smeared BCS density of states. Simple fit of the data gave average value of the Δ =38.5 meV and reduced gap 2\Delta /kT_c\simeq 8, consistent with a very strong coupling mechanism.