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Anomalous behavior around 220 K in optimal doped YBa2Cu3O7-delta investigated by Sr substitution

机译：通过Sr替代研究最佳掺杂YBa2Cu3O7-δ中220 K附近的异常行为

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摘要

Much interest has been paid to the origination of anomalous behavior around 220 K in optimal doped YBa2Cu3O7-delta (Y123). In mechanical spectroscopy, an internal friction peak (labeled as P1) was observed in this temperature range. Following a previous internal friction study of Sr substituted Y123, Raman spectroscopy was used to evaluate the structural change during Sr substitution. A clear change of Raman phonon at 340 cm(-1), which corresponds to the vibrations of the oxygen atoms in two adjacent planes out of phase and out of the plane, was observed with Sr substitution. Then a correlation between internal friction P I peak and Raman spectrum supports the close relationship between P1 with the CuO2 plane rather than CuOx chains. Furthermore, the possible relationship of P1 with the dynamical stripe scenario was discussed. (c) 2006 Elsevier Ltd. All rights reserved.
机译：在最佳掺杂的YBa2Cu3O7-δ（Y123）中，人们对引起220 K附近的异常行为引起了极大的兴趣。在机械光谱学中，在此温度范围内观察到内部摩擦峰（标记为P1）。在先前对取代Sr的Y123进行内部摩擦研究之后，拉曼光谱用于评估取代Sr期间的结构变化。用Sr取代观察到在340 cm（-1）处的拉曼声子有明显变化，这对应于两个相邻平面异相和平面外的氧原子的振动。然后，内部摩擦力P I峰值和拉曼光谱之间的相关性支持P1与CuO2平面而不是CuOx链之间的紧密关系。此外，讨论了P1与动态条带方案的可能关系。 （c）2006 Elsevier Ltd.保留所有权利。

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