Frequencies, eigenvectors, and single-crystal selection rules of k=0 phonons in YBa2Cu3O7- delta : Theory and experiment.
Frequencies, eigenvectors, and single-crystal selection rules of k=0 phonons in YBa2Cu3O7- delta : Theory and experiment.
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YBa2Cu3O7-δ 中 k=0 声子的频率、特征向量和单晶选择规则：理论和实验。
DOI：
10.1103/physrevb.37.7971
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
U. Schröder
中科院分区：
文献类型：
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作者：
R. Liu;C. Thomsen;W. Kress;M. Cardona;B. Gegenheimer;de Wette Fw;J. Prade;A. D. Kulkarni;U. Schröder
本文测定了单晶超导体YBa/sub 2/Cu/sub 3/O/sub 7/. sqrt../ sub delta/对于大约500、440、330和150 cm/sup-1/的声子。除了330-cm/sup-1/模式为B/sub 1//sub g/四方结构外，它们都对应于四方结构（A/sub 1//sub g/）和斜方结构（A/sub g/）中的完全对称模式。我们还进行了晶格动力学计算，从钙钛矿和其他金属氧化物中提取的参数。得到的频率和特征向量与实验结果一致。这项工作解决了以前文献中发现的差异
We have determined the components of the Raman tensor of signal-crystal superconducting YBa/sub 2/Cu/sub 3/O/sub 7/..sqrt../sub delta/ for the phonons at approx.500, 440, 330, and 150 cm/sup -1/. They all correspond to the totally symmetric modes both in the tetragonal (A/sub 1//sub g/) and orthorhombic (A/sub g/) structures except for the 330-cm/sup -1/ mode which is B/sub 1//sub g/ tetragonal. We have also performed lattice dynamical calculations with parameters extracted from those of perovskite and other metallic oxides. The frequencies and eigenvectors obtained agree well with the experimental results. This work settles discrepancies found in the previous literature