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

*此作品的通信作者

研究成果: Article同行評審

摘要

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.

原文English
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Published - 1 12月 2007

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