ELECTRONIC RAMAN SCATTERING IN YBA2CU3O7 AND OTHER SUPERCONDUCTING CUPRATES
ELECTRONIC RAMAN SCATTERING IN YBA2CU3O7 AND OTHER SUPERCONDUCTING CUPRATES
复制标题
YBA2CU3O7 和其他超导铜酸盐中的电子拉曼散射
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
M. Cardona
中科院分区：
文献类型：
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作者：
T. Strohm;M. Cardona
本文采用三维量子力学LDA-LMTO方法计算了高温超导体电子拉曼谱中的超导诱导结构，并对三维布里渊区和费米面的质量涨落进行了数值积分.两种计算的结果相当相似，布里渊区积分产生了与扩展的货车霍韦奇点相关的额外弱结构。类似的计算已经进行了正常状态的这些高Tc铜酸盐。偏振配置进行了研究，并将结果与实验光谱进行了比较。简单的d_（x^2-y^2）能隙函数的假设可以解释许多实验特征，但很难与A1 g和B1 g峰的相对位置相一致。
Superconductivity induced structures in the electronic Raman spectra of high-Tc superconductors are computed using the results of ab initio LDA-LMTO three-dimensional band structure calculations via numerical integrations of the mass fluctuations, either in the whole 3D Brillouin zone or limiting the integrations to the Fermi surface. The results of both calculations are rather similar, the Brillouin zone integration yielding additional weak structures related to the extended van Hove singularities. Similar calculations have been performed for the normal state of these high-Tc cuprates. Polarization configurations have been investigated and the results have been compared to experimental spectra. The assumption of a simple d_(x^2-y^2)-like gap function allows us to explain a number of experimental features but is hard to reconcile with the relative positions of the A1g and B1g peaks.