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

研究成果: 雜誌貢獻期刊論文同行評審

摘要

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.

原文英語
頁(從 - 到)4598-4601
頁數4
期刊Physica Status Solidi (B) Basic Research
244
發行號12
DOIs
出版狀態已發佈 - 2007 十二月 1

ASJC Scopus subject areas

  • 電子、光磁材料
  • 凝聚態物理學

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