Reinterpretation of femtosecond laser pump-probe and thermomodulation optical spectroscopy results on HTSC materials in terms of the resonant negative-U model
Reinterpretation of femtosecond laser pump-probe and thermomodulation optical spectroscopy results on HTSC materials in terms of the resonant negative-U model
复制标题
根据共振负 U 模型重新解释 HTSC 材料的飞秒激光泵浦探针和热调制光谱结果
DOI：
10.1088/0953-8984/12/3/309
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
J. Wilson
中科院分区：
文献类型：
--
作者：
J. Wilson
Stevens等人的激光泵浦/探测光谱（YBCO_7）和Holcomb等人的热调制光学数据和分析（对HTSC材料的选择）在混合价铜酸盐的高温超导（HTSC）的共振负U机制方面进行了研究。工作集中在通用的1.5-2 eV的功能变得可见低于Tc后的光学“电荷转移”的边缘。有人认为，这些不是简单的p到d带到带的激发，但与混合价和负U状态，煽动高温超导。Stevens等人记录的新数据中明显的衰减特性以及Holcomb等人为适应他们自己的热调节数据而开发的Eliashberg分析结果都支持这一论点。提供的解释是符合最近提供的所有高温超导系统所表现出的高度特征热电行为。
The laser pump/probe spectroscopy from Stevens et al (on YBCO7 ) and the thermomodulation optical data and analysis from Holcomb et al (on a selection of HTSC materials) are examined in terms of the resonant negative-U mechanism for high temperature superconductivity (HTSC) in the mixed-valent cuprates. The work centres on the universal 1.5-2 eV features becoming visible below Tc upon the optical `charge-transfer' edge. These it is argued are not simple p-to-d band-to-band excitations but are to be associated with the mixed-valent and negative-U states that instigate HTSC. This argument is supported both by the decay characteristics apparent in the new data recorded by Stevens et al and also in the outcome of the Eliashberg analysis developed by Holcomb et al to accommodate their own thermomodulation data. The interpretation provided is in line with that offered recently of the highly characteristic thermoelectric behaviour exhibited by all HTSC systems.