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Anomalous dispersion of longitudinal optical phonons in oxygen-dopedLa2−xSrxCuO4+δ
Physical Review B ( IF 3.7 ) Pub Date : 2020-03-25 , DOI: 10.1103/physrevb.101.100504
Tim Tejsner , Andrea Piovano , Ana Ţuţueanu , Astrid T. Rømer , Barrett O. Wells , Jean-Claude Grivel , Martin Boehm , Linda Udby

Inelastic neutron scattering has been used to study the in-plane Cu-O bond-stretching mode in oxygen-doped La1.94Sr0.06CuO4.035 (Tc=38K) and La2CuO4+δ (Tc=43K). Similar to results from optimally doped La1.85Sr0.15CuO4 (Tc=35K), we observe anomalous features in the dispersion of this half-breathing mode in the form of a softening halfway through the Brillouin zone. Considering the differences in electronic structure and local environment between the oxygen- and strontium-doped compounds with similar Tc, we rule out a connection between the phonon anomaly and structural instabilities related to the specific dopant type. We interpret the phonon anomaly as a signature of correlated charge fluctuations ubiquitous in optimally doped superconductors.

中文翻译:

纵向光学声子在氧掺杂的La2-xSrxCuO4 +δ中的反常色散

非弹性中子散射已用于研究掺杂氧的面内Cu-O键拉伸模式 1.94r0.06氧化铜4.035 ŤC=38ķ2氧化铜4+δ ŤC=43ķ。类似于最佳掺杂的结果1.85r0.15氧化铜4 ŤC=35ķ,我们观察到这种半呼吸模式的弥散具有异常特征,该异常特征是通过布里渊区的中途变软。考虑相似的氧和锶掺杂化合物之间的电子结构和局部环境的差异ŤC,我们排除了声子异常与与特定掺杂剂类型有关的结构不稳定性之间的联系。我们将声子异常解释为在最佳掺杂超导体中普遍存在的相关电荷波动的标志。
更新日期:2020-03-26
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