NDLI: Tunneling spectroscopy of Bi(Pb)-Sr-Ca-Cu-O superconductors

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Tunneling spectroscopy of Bi(Pb)-Sr-Ca-Cu-O superconductors

Content Provider	Semantic Scholar
Author	Ponomarev, Ya. G. Os'kina, T. E. Aminov, B. A. Kupriyanov, Mikhail Rakhimov, H. T. Sethupathi, Kanikrishnan Sudakova, M. V. Tret’yakov, Yu. D. Piel, Helmut Wehler, D.
Copyright Year	1993
Abstract	Abstract The tunneling characteristics for break junctions in polycrystalline Bi 1.7 Pb 0.4 Sr 2−X Ca 2+Y Cu 3+Z O 10+δ samples fabricated by direct mixing of oxides-carbonates (1) and via Bi(Pb)-Ca − O + Sr-Ca-Cu-O precursors (2) have been investigated. Long time annealing of the samples (1) causes decomposition in the form of the intergrowth faults (2212 - in 2223 - phase), which leads to the formation of the natural superlattice of the type S 1 -S 2 -S 1 -S 2 -. and to an emergence of a reproducible vertical rise of current in the I-V characteristics for break junctions at voltages V ≅ ± 2Δ/e. A record value of the characteristic voltage V c = I c R n = (31 ± 4) m V at T=4.2K has been detected. Evidence for an important role of the proximity effect in the samples (1) has been obtained. For the samples (2) the tunneling characteristics were strongly dependent on X, Y and Z. The samples with X=0.2, Y=Z=0 consist of an almost pure 2223-phase with a large gap parameter Δ=(31 ± 1)meV (T=4.2K). For these samples the subharmonic structure in the I-V characteristics, caused by the self-detection of Josephson radiation was observed. From I-V and dI/dV - V characteristics the tunneling density of states has been calculated. The advantage of the method of precursor synthesis for the effective modification of superconducting properties of Bi(Pb)-Sr-Ca-Cu-O has been demonstrated.
Starting Page	551
Ending Page	554
Page Count	4
File Format	PDF HTM / HTML
DOI	10.1016/0925-8388(93)90797-Q
Volume Number	195
Alternate Webpage(s)	https://istina.msu.ru/download/12229627/1hrZWt:AnHp2fmlbNZrcb_jow-61RZV0X0/
Alternate Webpage(s)	https://doi.org/10.1016/0925-8388%2893%2990797-Q
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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