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首页> 外文期刊>Physica, C. Superconductivity and its applications >Elementary excitations investigated by femtosecond Raman spectroscopy in underdoped cuprates
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Elementary excitations investigated by femtosecond Raman spectroscopy in underdoped cuprates

机译：飞秒拉曼光谱研究低掺杂铜酸盐中的基本激发

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摘要

Magnetic excitations have been investigated in heavily underdoped Bi2212 by femtosecond Raman spectroscopy. From time-resolved Raman spectra of the B-1g two-magnon peak, we observed a fast relaxation component of 0.4 ps and a slow component with a lifetime of tau approximate to 70 ps. The fast response was analyzed in terms of a rate equation considering non-radiative CT relaxation process, magnon emission, and magnon decay process. On the other hand, the A(1g) + B-2g component showed time constant of tau approximate to 15 ps. The different time response clearly indicates that the origin of the peak observed in x'x' configuration is different from the two-magnon peak observed in B-1g symmetry. (C) 2003 Elsevier B.V. All rights reserved. [References: 4]
机译：飞秒拉曼光谱已在重掺杂不足的Bi2212中研究了磁激发。从时间分辨的B-1g两磁振子峰的拉曼光谱中，我们观察到0.4 ps的快速弛豫分量和tau寿命约为70 ps的慢速弛豫分量。根据考虑非辐射CT弛豫过程，磁振子发射和磁振子衰变过程的速率方程对快速响应进行了分析。另一方面，A（1g）+ B-2g成分的tau时间常数约为15 ps。不同的时间响应清楚地表明，在x'x'构型中观察到的峰的起源与在B-1g对称性中观察到的两磁子峰不同。 （C）2003 Elsevier B.V.保留所有权利。 [参考：4]

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