Inelastic light scattering studies of overdoped y1-xCa xBa2Cu3O7-δ thin film

J. H. Lin, S. M. Weng, H. L. Liu, P. C. Chung, J. Y. Lin

Research output: Contribution to journalArticlepeer-review

Abstract

The vibrational and magnetic Raman excitation spectra were examined in overdoped Y1-xCaxBa2Cu3O 7-δ thin films. Below Tc, certain phonons in undoped YBa2Cu3O7-δ (YBCO) show strong self-energy effects, which gradually vanish with increasing Ca concentration into the overdoped regime. The observed B1g symmetry two-magnon excitation peak near 2900 cm-1 in YBCO is significantly broadened, weakened, and shifts to the lower frequency with increasing Ca content, indicating the effective value of magnetic superexchange energy decreases and that the life time of the magnons becomes shorter with increasing hole concentrations.

Original languageEnglish
Pages (from-to)4598-4601
Number of pages4
JournalPhysica Status Solidi (B) Basic Research
Volume244
Issue number12
DOIs
Publication statusPublished - 2007 Dec 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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