Systematic Raman study on Tl-based superconductors with Tc-variation due to oxygen deficiency

K. Matsuishi, Y. Q. Wang, Y. Y. Sun, J. G. Lin, P. H. Hor, M. Gorman, C. W. Chu

Research output: Contribution to journalConference articlepeer-review

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Abstract

Using a Raman microprobe technique, we have measured the Raman spectra of single crystallites of Tl2Ba2Can-1CunO2n+4-d (n = 1,2 and 3) with Tc varied by oxygen removal or addition. It is found in Tl2Ba2CuO6-d that the photon modes associated with the vibrations of bridging 02 in Ba-O planes (approximately 485 cm-1) and 03 in Tl-0 planes (approximately 600 cm-1) increase in frequency and become broader as the Tc increases from 0 to 70 K with oxygen removal, while the Ba and Tl vibration modes do not change appreciably. The observations are attributed to the valence change of Tl, resulting from a change in the charge transfer between Tl and (Cu-01), and to the distortion and/or disorder in Tl-0 planes due to the oxygen removal. There is a clear correlation between Tc and phonon frequencies in Tl-based superconductors. We suggest that a change in charge distribution in (Cu-O1)-02-(Tl-03) complexes is responsible for the phonon frequency shifts observed in 02 and 03 vibration modes.

Original languageEnglish
Pages (from-to)93-105
Number of pages13
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume1336
Publication statusPublished - 1990
EventRaman and Luminescence Spectroscopies in Technology II - San Diego, CA, USA
Duration: 1990 Jul 101990 Jul 12

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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