利用高能光导研究轻空穴掺杂铜氧化物中Zhang-Rice单重态的局域自旋极化
Unravelling local spin polarization of Zhang-Rice singlet in lightly hole-doped cuprates using high-energy optical conductivity
摘要：
为了理解关联电子系统中丰富的物理性质，揭示载流子附近的局部磁和电子关联是至关重要的。在这里，使用高能量的光学电导率（高达35 eV）作为温度和极化的函数，我们观察到一个令人惊讶的强自旋极化的本地自旋单线态与增强的铁磁相关性附近的掺杂空穴在轻空穴掺杂的La $_{1.95}$ Sr $_{0.05}$ Cu $_{0.95}$ Zn $_{0.05}$ O $_{4}$。局域自旋极化的变化强烈地表现在温度依赖的光学电导率在~7.2 eV，在磁条相（~25 K）的异常，伴随着异常的光谱重量转移在一个广泛的能量范围。在理论计算的支持下，我们还指定了高能光学跃迁及其相应的温度依赖性，特别是在~2.5 ~8.7，~9.7，~11.3和~21.8 eV。我们的研究结果显示了空穴掺杂铜氧化物中自旋单重态和三重态的强混合的重要性，并展示了一种新的策略，以探测局部磁关联在相关电子系统中使用高能光学电导率。
英文摘要：
Unrevealing local magnetic and electronic correlations in the vicinity of charge carriers is crucial in order to understand rich physical properties in correlated electron systems. Here, using high-energy optical conductivity (up to 35 eV) as a function of temperature and polarization, we observe a surprisingly strong spin polarization of the local spin singlet with enhanced ferromagnetic correlations between Cu spins near the doped holes in lightly hole-doped La$_{1.95}$Sr$_{0.05}$Cu$_{0.95}$Zn$_{0.05}$O$_{4}$. The changes of the local spin polarization manifest strongly in the temperature-dependent optical conductivity at ~7.2 eV, with an anomaly at the magnetic stripe phase (~25 K), accompanied by anomalous spectral-weight transfer in a broad energy range. Supported by theoretical calculations, we also assign high-energy optical transitions and their corresponding temperature dependence, particularly at ~2.5 ~8.7, ~9.7, ~11.3 and ~21.8 eV. Our result shows the importance of a strong mixture of spin singlet and triplet states in hole-doped cuprates and demonstrates a new strategy to probe local magnetic correlations using high- energy optical conductivity in correlated electron systems.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
