Damped spin excitations in a doped cuprate superconductor with orbital hybridization
O. Ivashko, N. E. Shaik, X. Lu, C. G. Fatuzzo, M. Dantz, P. G. Freeman, D. E. McNally, D. Destraz, N. B. Christensen, T. Kurosawa, N. Momono, M. Oda, C. Monney,… 展开作者
O. Ivashko, N. E. Shaik, X. Lu, C. G. Fatuzzo, M. Dantz, P. G. Freeman, D. E. McNally, D. Destraz, N. B. Christensen, T. Kurosawa, N. Momono, M. Oda, C. Monney, H. M. Rønnow, T. Schmitt, J. Chang
A resonant inelastic x-ray scattering (RIXS) study of overdamped spin-excitations in slightly underdoped La$_{2-x}$Sr$_{x}$CuO$_4$ (LSCO) with $x=0.12$ and $0.145$ is presented. Three high-symmetry directions have been investigated: (1) the antinodal $(0,0)\rightarrow (1/2,0)$, (2) the nodal $(0,0)\rightarrow (1/4,1/4)$ and (3) the zone boundary direction $(1/2,0)\rightarrow (1/4,1/4)$ connecting these two. The overdamped excitations exhibit strong dispersions along (1) and (3), whereas a much more modest dispersion is found along (2). This is in strong contrast to the undoped compound La$_{2}$CuO$_4$ (LCO) for which the strongest dispersions are found along (1) and (2). The $t-t^{\prime}-t^{\prime\prime}-U$ Hubbard model used to explain the excitation spectrum of LCO predicts $-$ for constant $U/t$ $-$ that the dispersion along (3) scales with $(t^{\prime}/t)^2$. However, the diagonal hopping $t^{\prime}$ extracted on LSCO using single-band models is low ($t^{\prime}/t\sim-0.16$) and decreasing with doping. We therefore invoked a two-orbital ($d_{x^2-y^2}$ and $d_{z^2}$) model which implies that $t^{\prime}$ is enhanced. This effect acts to enhance the zone-boundary dispersion within the Hubbard model. We thus conclude that hybridization of $d_{x^2-y^2}$ and $d_{z^2}$ states has a significant impact on the zone-boundary dispersion in LSCO.
Hybridization of lattice and charge order excitations in a superconducting cuprate
Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology（卡尔斯鲁厄理工学院量子材料与技术研究所）；Materials Dynamics Laboratory, RIKEN SPring-8 Center（RIKEN SPring-8中心材料动力学实验室）；Precision Spectroscopy Division, Japan Synchrotron Radiation Research Institute（日本同步辐射研究所精密光谱部）；ESRF, The European Synchrotron（欧洲同步辐射装置）；Max Planck Institute for Solid State Research（马克斯·普朗克固体研究所）；Karlsruhe Nano Micro Facility (KNMFi), Karlsruhe Institute of Technology（卡尔斯鲁厄理工学院卡尔斯鲁厄纳米微观设施）
Hybridization of Bogoliubov-quasiparticles between adjacent CuO$_2$ layers in the triple-layer cuprate Bi$_2$Sr$_2$Ca$_2$Cu$_3$O$_{10+δ}$ studied by ARPES
我们追求的理论中，在欠掺杂和最佳掺杂的YBa $_2$ Cu $_3$ O $_{6+x}$化合物的非弹性中子散射（INS）实验中观察到的共振峰产生的自旋波激发的后果。我们发现，它是严重的阻尼，因此几乎无法观察到，在正常状态下，但变得可见的超导状态，由于自旋阻尼急剧下降。我们表明，自旋费米子模型正确地描述了YBa $_2$ Cu $_3$ O $_7$的峰位置的温度依赖性，以及掺杂的峰位置和积分强度的依赖性。我们解释了为什么在La $_{2-x}$ Sr $_x$ CuO $_4$中没有观察到共振峰，并对其他铜酸盐超导体中的共振峰作了一些预测。
Altermagnetism from a Cu-Fe Lieb Lattice in FeSe/Cuprate Heterostructures
Xi’an Jiaotong University（西安交通大学）；Technical University of Munich（慕尼黑工业大学）；Université de Sherbrooke（舍布鲁克大学）；Munich Center for Quantum Science and Technology (MCQST)（慕尼黑量子科学与技术中心）；Donostia International Physics Center（圣塞巴斯蒂安国际物理中心）；Regroupement Québécois sur les Matériaux de Pointe (RQMP)（魁北克尖端材料联盟）；Goethe-Universität Frankfurt（法兰克福歌德大学）
Ni-O hybridization-driven electronic reconstruction across the superconducting dome in an infinite-layer nickelate
National University of Singapore（新加坡国立大学）；Agency for Science, Technology and Research (A*STAR)（科学与技术研究局）；Shanghai University（上海大学）；Southern University of Science and Technology（南方科技大学）
Itinerant effects and enhanced magnetic interactions in Bi-based multilayer cuprates
铜酸盐高温超导体表现出明显的趋势，其中超导转变温度$T_{\rm c}$随着晶体结构中CuO $_2$平面的数目$n$而增加。我们用Cu $L_3$ -边共振非弹性X射线散射（RIXS）比较了Bi $_{2+x}$ Sr $_{2-x}$ CuO $_{6+δ}$（Bi-2201）和Bi $_2$ Sr $_2$ Ca $_2$ Cu $_3$ O $_{10 + δ}$（Bi-2223）分别与$n=1$和$n=3$的磁激发谱。在反结区边界附近，我们发现Bi-2223的顺磁子能量显著高于Bi-2201，表明多层铜氧化物具有更强的有效磁交换作用，这为$T_{\rm c}$与Bi-2201的磁交换效应提供了可能的解释。$n$缩放。相反，节点方向表现出非常强的阻尼，几乎非色散激励。我们认为，这意味着在掺杂铜酸盐的磁性是部分巡回性质。
Conditions for orbital selective altermagnetism in Sr$_2$RuO$_4$: tight binding model, similarities with cuprates and implications on superconductivity
Intense paramagnon excitations in a large family of high-temperature superconductors
在高温超导机制的研究中，人们一直关注的是铜氧化物从反铁磁绝缘态到超导态掺杂后自旋激发谱的演化。由于技术上的限制，掺杂铜氧化物的实验研究主要集中在小范围动量空间的低能激发。在这里，我们使用共振非弹性X射线散射表明，一个大的家庭的超导体，包括欠掺杂的YBa $_2$铜$_4$ O $_8$和过掺杂的YBa $_2$铜$_3$ O $_{7}$，表现出阻尼自旋激发（顺磁子）的色散和光谱权重密切类似于那些在未掺杂的铜氧化物的磁振子。结果与有限尺寸团簇上$\bf t-J$哈密顿量精确对角化得到的自旋激发非常一致。这个令人惊讶的简单光谱的全面实验描述允许磁性库珀配对模型的定量测试。数值解的Eliashberg方程的YBa $_2$ Cu $_3$ O $_{7}$的磁谱再现其超导转变温度的一个因素内的两倍，一个协议的水平相媲美Eliashberg理论的传统超导体。
Visualizing the Zhang-Rice singlet, molecular orbitals and pair formation in cuprate
Tsinghua University（清华大学）；Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所）；New Cornerstone Science Laboratory（新基石科学实验室）；Frontier Science Center for Quantum Information（量子信息前沿科学中心）；Hefei National Laboratory（合肥国家实验室）
Universal orbital and magnetic structures in infinite-layer nickelates
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory（斯坦福材料能源科学研究所，SLAC国家加速器实验室）；Department of Physics, Stanford University（斯坦福大学物理系）；School of Applied and Engineering Physics, Cornell University（康奈尔大学应用工程物理学院）；Kavli Institute at Cornell for Nanoscale Technology, Cornell University（康奈尔大学纳米技术卡弗里研究所）；Diamond Light Source（钻石光源）；Department of Materials Science and Engineering, Stanford University（斯坦福大学材料科学与工程系）
On the theory of supermodulation of the superconducting order parameter created by structural supermodulation of apex distance in optimally doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+x}$
Georgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences（保加利亚科学院格奥尔吉·纳贾科夫固体物理研究所）
