铜酸盐氧氯化物高温超导单晶中的拉曼散射
Raman scattering in cuprate oxychlorides high-temperature superconductors single-crystals
- Karlsruhe Institute of Technology（卡尔斯鲁厄理工学院）
- Institut NEEL CNRS/UGA UPR2940（NEEL研究所）
- IMPMC-Sorbonne Universités, Université Pierre et Marie Curie, CNRS, IRD, MNHN（IMPMC-索邦大学，皮埃尔和玛丽·居里大学，CNRS，IRD，MNHN）
- Synchrotron SOLEIL（SOLEIL同步辐射中心）
- Department of Physics, University of Fribourg（弗里堡大学物理系）
- Department of Materials Science, Graduate School of Engineering, Osaka Metropolitan University（大阪公立大学工学研究科材料科学系）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究通过拉曼散射测量钠掺杂铜酸盐氧氯化物高温超导体，发现强电子-声子耦合引发的共振模式及双磁振子，并追踪其温度与掺杂依赖，关联交换相互作用。
AI中文摘要：
我们研究了钠掺杂铜酸盐氧氯化物Na$_x$Ca$_{2-x}$CuO$_2$Cl$_2$高温超导体在整个相图中的拉曼响应，范围从反铁磁区到超导区。除了预期的拉曼活性声子模式外，我们还检测到几种额外的模式，这些模式可以被解释为通过强电子-声子耦合实现的共振过程所激发。为了验证共振效应，我们测量了不同入射光子能量下的拉曼响应。在高能量下，反铁磁相中存在一个明确的$B_{1g}$模式，可解释为双磁振子。我们追踪了其温度和掺杂依赖性，提供了这些铜酸盐中多磁振子激发的信息，这些信息在理论上可与交换相互作用相关联。
英文摘要：
We investigate the Raman response of sodium-doped cuprate oxychloride Na$\_x$Ca$\_{2-x}$CuO$\_2$Cl$\_2$ high-temperature superconductors across their entire phase diagram, from the antiferromagnetic to the superconducting region. In addition to the expected Raman-active phonon modes, we detect several additional modes that can be interpreted as being excited via a resonance process enabled by strong electron--phonon coupling. To verify the resonance effect, the Raman response at different incident photon energies was measured. At high energies, there is a well-defined $B\_{1g}$ mode in the antiferromagnetic phase, which can be interpreted as a bimagnon We follow its temperature and doping dependence, providing information on the multimagnon excitation in these cuprates, which can be theoretically linked to the exchange interaction.
