ab-plane tunneling and Andreev spectroscopy of superconducting gap an pseudogap in

Автор(и)

  • A.I. D`yachenko A. Galkin Donetsk Physical and Technical Institute of the National Academy of Sciences of Ukraine 72 R. Luxemburg Str., Donetsk 83114, Ukraine
  • V.Yu. Tarenkov A. Galkin Donetsk Physical and Technical Institute of the National Academy of Sciences of Ukraine 72 R. Luxemburg Str., Donetsk 83114, Ukraine
  • R. Szymczak Institute of Physics, Polish Academy of Sciences, 32/46 Al. Lotników, 02-668 Warsaw, Poland
  • H. Szymczak Institute of Physics, Polish Academy of Sciences, 32/46 Al. Lotników, 02-668 Warsaw, Poland
  • A.V. Abal`oshev Institute of Physics, Polish Academy of Sciences, 32/46 Al. Lotników, 02-668 Warsaw, Poland
  • S.J. Lewandowski Institute of Physics, Polish Academy of Sciences, 32/46 Al. Lotników, 02-668 Warsaw, Poland
  • L. Leonyuk Moscow State University, Moscow, 118899 Russia

Ключові слова:

PACS: 74.25.Jb, 74.50. r, 74.72.-h

Анотація

We have measured the temperature dependence of gap features revealed by Andreev reflection (Ds) and by tunneling (D) in the ab-plane of optimally and slightly overdoped microcrystals of (BiPb)2Sr2Ca2Cu3O10+d (Bi2223) with critical temperature Tc = 110-115 K, and Bi2Sr2CaCu2O8+d (Bi2212) with Tc = 80-84 K. The tunneling conductance of a Bi2223-insulator-Bi2223 junction shows peaks at the 2D gap voltage, as well as dips and broad humps at other voltages. In Bi2223, similarly to the well-known Bi2212 spectra, the energies corresponding to 2D, to the dip, and to the hump structure are in the ratio 2:3:4. This confirms that the dip and hump features are generic to the high-temperature superconductors, irrespective of the number of CuO2 layers or the BiO superstructure. On the other hand, in both compounds the D(T) and Ds(T) dependences are completely different, and we conclude that the two entities are of different natures.

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Опубліковано

2002-12-29

Як цитувати

(1)
D`yachenko, A.; Tarenkov, V.; Szymczak, R.; Szymczak, H.; Abal`oshev, A.; Lewandowski, S.; Leonyuk, L. ab-Plane Tunneling and Andreev Spectroscopy of Superconducting Gap an Pseudogap in . Fiz. Nizk. Temp. 2002, 29, 149-155.

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Надпровідність, зокрема високотемпературна

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