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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2001, Volume 73, Issue 3, Pages 159–162
(Mi jetpl4311)
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This article is cited in 2 scientific papers (total in 2 papers)
CONDENSED MATTER
Superconducting energy gap in Bi$_2$Sr$_2$Ca$_2$Cu$_3$O$_{10+\delta}$ (Bi2223) single crystals
S. I. Vedeneev, V. A. Stepanov P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow
Abstract:
Current-voltage characteristics of $S{-}I{-}S$ tunnel break junctions fabricated from pure undoped Bi2223 single crystals ($T_c=110$ 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 $ 2\Delta _{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 $\Delta =38.5$ meV and reduced gap $2\Delta /kT_c\simeq 8,$ consistent with a very strong coupling mechanism.
Received: 28.12.2000
Citation:
S. I. Vedeneev, V. A. Stepanov, “Superconducting energy gap in Bi$_2$Sr$_2$Ca$_2$Cu$_3$O$_{10+\delta}$ (Bi2223) single crystals”, Pis'ma v Zh. Èksper. Teoret. Fiz., 73:3 (2001), 159–162; JETP Letters, 73:3 (2001), 141–144
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https://www.mathnet.ru/eng/jetpl4311 https://www.mathnet.ru/eng/jetpl/v73/i3/p159
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