Temperature dependence of reflectivity spectra of oxide conductors and superconductors
Temperature dependence of reflectivity spectra of oxide conductors and superconductors
复制标题
氧化物导体和超导体反射率光谱的温度依赖性
DOI：
10.1080/00150199608216957
复制
发表时间：
1996
期刊：
影响因子：
0.8
通讯作者：
F. Gotor
中科院分区：
文献类型：
--
作者：
F. Gervais;R. Lobo;M. Licheron;F. Gotor
本文综述了几种导电氧化物TiO5、NbO2、La2NiO4及其镍酸盐BaBiO3、(Ba，K)2(PbBiO4)、Nb掺杂的SrTiO3、YBa2Cu3O7-5的红外-可见-近紫外光谱及其与温度的关系。由扩展到超导相中两种流体的移动电荷载流子的修正的Drud型贡献，加上对声子、囚禁极化子或光学带隙有效的多振子项组成的通用模型，能够拟合绝缘、导电和超导氧化物的光谱。强调指出，该模型考虑了激发的耦合。忽略这种耦合，通过简单的附加贡献去卷积来提取信息，可能会导致不正确的频率和强度，如中红外带和超导凝聚体的例子所示。
The infrared-visible-near-ultraviolet spectra of a number of conducting oxides TiO2-5, NbO2, La2NiO4 and related nickelates, BaBiO3, (Ba, K)2(Pb, Bi)O4, Nb-doped SrTiO3, YBa2Cu3O7-5, and their temperature dependence, are reviewed. A common model consisting of a modified Drude-type contribution for mobile charge carriers extended to two fluids in the superconducting phase, added to a multi-oscillator term valid for phonons, trapped polarons or optical gaps, is able to fit the spectra of insulating, conducting and superconducting oxides. It is emphasised that the model accounts for the coupling of the excitations. Ignoring such couplings and extracting information by simple deconvolution of added contributions may give rise to incorrect frequencies and intensities as is shown in the examples of mid-infrared bands and superconducting condensate.