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Temperature effects in optical absorption of superconducting YBCO(7-) films.

[In Russian. / En russe.]

Author(s) : FUGOL I. Ja., SAMOVAROV V. N., RYBALKO Ju. I., et al.

Type of article: Article

Summary

Temperature behaviour of absorption spectra of superconducting YBCO(7-) films in a 1.5-3.0 electronvolt energy region was measured with temperatures varying from 25 to 300 K. The spectra are found to be sensitive to the superconducting transition, and the 1.95 electronvolt exciton maximum at low temperatures is observed which can be accounted for by the transition from the near-Fermi states. The absorption spectrum freezing at T not higher than critical temperature may be explained assuming a temperature resonance of the Fermi level with a narrow local one which corresponds to a delta-shaped singularity in the density of states.

Details

  • Original title: [In Russian. / En russe.]
  • Record ID : 1993-0707
  • Languages: Russian
  • Source: Fiz. nizk. Temp. - vol. 17 - n. 7
  • Publication date: 1991
  • Document available for consultation in the library of the IIR headquarters only.

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