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首页> 外文期刊>Physica, C. Superconductivity and its applications >EXAFS observation of two distinct Bi-O distances below T-c for a Ba0.6K0.4BiO3 single crystal
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EXAFS observation of two distinct Bi-O distances below T-c for a Ba0.6K0.4BiO3 single crystal

机译:Ba0.6K0.4BiO3单晶的EXAFS观察到T-c以下两个不同的Bi-O距离

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摘要

In order to find two distinct Bi-O distances as evidence for the breathing mode distortion due to an electron-phonon interaction below T-c, extended X-ray absorption fine structure of Bi L-3-edge is measured from 14 to 300 K for a high quality single-crystal Ba0.6K0.4BiO3. The two distinct Bi-O bond lengths are obtained from data analyzed by a two-shell fit, and the Bi-O distances are similar to that in BaBiO3, independent of temperature. They come from a remnant phase of BaBiO3. Bi-O peaks coming from the superconducting phase are not analyzed because the Bi-O peaks overlap. Further, the Debye-Waller factor (sigma(2)) for Bi-O bonds does not fit Einstein model with increasing temperature. (C) 2003 Elsevier B.V. All rights reserved. [References: 26]
机译:为了找到两个不同的Bi-O距离作为由Tc以下的电子-声子相互作用引起的呼吸模式畸变的证据,Bi L-3-edge的扩展X射线吸收精细结构的测量范围为14 K至300K。高质量的单晶Ba0.6K0.4BiO3。两种不同的Bi-O键长是通过双壳拟合分析的数据获得的,且Bi-O距离与BaBiO3中的相似,与温度无关。它们来自BaBiO3的残余相。由于Bi-O峰重叠,因此未分析来自超导相的Bi-O峰。此外,随着温度的升高,Bi-O键的Debye-Waller因子(sigma(2))不适合爱因斯坦模型。 (C)2003 Elsevier B.V.保留所有权利。 [参考:26]

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