Inelastic light scattering studies of overdoped y 1-x Ca x Ba 2 Cu 3 O 7-δ thin film

J. H. Lin, S. M. Weng, H. L. Liu*, P. C. Chung, Jiunn-Yuan Lin

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The vibrational and magnetic Raman excitation spectra were examined in overdoped Y 1-x Ca x Ba 2 Cu 3 O 7-δ thin films. Below T c , certain phonons in undoped YBa 2 Cu 3 O 7-δ (YBCO) show strong self-energy effects, which gradually vanish with increasing Ca concentration into the overdoped regime. The observed B 1g 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
StatePublished - 1 Dec 2007

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