Superconducting energy gap in Bi2Sr2Ca2Cu3O10+δ (Bi2223) single crystals

被引：0
作者：
S. I. Vedeneev
V. A. Stepanov
机构：
[1] Russian Academy of Sciences,Lebedev Institute of Physics
来源：
Journal of Experimental and Theoretical Physics Letters | 2001年 / 73卷
关键词：
4.50.+r; 74.72.Hs;
D O I：
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摘要：
Current-voltage characteristics of S-I-S tunnel break junctions fabricated from pure undoped Bi2223 single crystals (Tc=110 K) were measured. High quality of the crystals enabled production of good tunnel junctions with a low or almost zero leakage current and well developed gap structure in the tunneling spectra. The peak-to-peak energy gap values 2Δp-p in different crystals and the tunnel junctions ranged from 80 to 105 meV. The tunneling conductance in the superconducting state was normalized to that in the normal state and compared to a smeared BCS density of states. A simple fit of the data gave the average value of Δ=38.5 meV and reduced gap 2Δ/kTc≃8, consistent with a very strong coupling mechanism.
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页码：141 / 144
页数：3
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