论文标题
不一致的结构对Crystalline BI $ _2 $ SR $ _2 $ CACU $ _2 $ o $ $ _ {8+δ} $的弹性常数的影响
Influence of incommensurate structure on the elastic constants of crystalline Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ by Brillouin light scattering spectroscopy
论文作者
论文摘要
Brillouin Light散射光谱用于探测Crystalline High-T_C $ SuperConductor BI $ _2 $ _2 $ _2 $ _2 $ CACU $ _2 $ _2 $ _2 $ o $ _ {8+δ} $的室温弹性。使用声音声子速度和弹性常数之间建立的关系以及与构成不相关的sublattices的相应常数相关的简单表达，将一组完整的最佳弹性常数以及与晶体弹性常数$ c_ {22} $相关的简单表达获得。后一种关系是在本工作中得出和验证的，这对研究不稳定系统的人具有重要意义，因为看来它可以以其一般形式应用于任何复合材料的不相关晶体。这项工作中获得的结果也与BI $ _2 $ sr $ _2 $ o $ $ _4 $的Sublattice分配一致，而CACU $ _2 $ o $ _4 $在以前的Brillouin散射研究中报告。
Brillouin light scattering spectroscopy was used to probe the room-temperature elasticity of crystalline high-$T_c$ superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$. A complete set of best-estimate elastic constants was obtained using established relationships between acoustic phonon velocities and elastic constants along with a simple expression relating crystal elastic constant $C_{22}$ to the corresponding constants of the constituent incommensurate sublattices. This latter relationship, which was derived and validated in the present work, has important implications for those studying incommensurate systems as it appears that it may be applied in its general form to any composite incommensurate crystal. The results obtained in this work are also consistent with sublattice assignments of Bi$_2$Sr$_2$O$_4$ and CaCu$_2$O$_4$ reported in a previous Brillouin scattering study.
