由双空穴谱确定超交换能的实验研究
Experimental determination of superexchange energy from two-hole spectra
摘要：
我们遵循铜和氧的双空穴激发的演变，在最佳掺杂的（Ca $_{x}$ La $_{1-x}$）（Ba $_{1.75-x}$ La $_{0.25+x} $）Cu $_{3}$ O $_{y}$的$x=0.1$和$x=0.4$。光谱有贡献的带态以及本地化的多重态结构。从他们的鉴定，我们确定壳内库仑相互作用$U$的氧和铜网站。这些结果使我们能够估计的原子超交换耦合$J$建议之间的最大超导临界温度$T_\text{C}^{max}$和$J$的正相关。
英文摘要：
We follow the evolution of Copper and Oxygen two-hole excitations, in optimally doped (Ca$_{x}$La$_{1-x}$)(Ba$_{1.75-x}$La$_{0.25+x} $)Cu$_{3}$O$_{y}$ for $x=0.1$ and $x=0.4$. The spectra have contributions from band states as well as a localized multiplet structure. From their identification, we determine the intrashell Coulomb interaction $U$ for Oxygen and Copper sites. These results allow us to estimate the atomic superexchange coupling $J$ suggesting a positive correlation between the maximal superconducting critical temperature $T_\text{C}^{max}$ and $J$.
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