High-Energy Magnetic Excitations in the Cuprate Superconductor Bi2Sr2CaCu2O8+δ: Towards a Unified Description of Its Electronic and Magnetic Degrees of Freedom
High-Energy Magnetic Excitations in the Cuprate Superconductor Bi2Sr2CaCu2O8+δ: Towards a Unified Description of Its Electronic and Magnetic Degrees of Freedom
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DOI：
10.1103/physrevlett.110.147001
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发表时间：
2013-04-03
影响因子：
8.6
通讯作者：
Hill, J. P.
中科院分区：
文献类型：
--
作者：
Dean, M. P. M.;James, A. J. A.;Hill, J. P.
我们利用 Cu L-3 边缘共振非弹性 X 射线散射研究了高 T-c 铜酸盐超导体 Bi2Sr2CaCu2O8+delta (Bi-2212) 的高能磁激发谱。观察到广泛的、色散的磁激发，区域边界能量接近 300 meV，并且对掺杂的依赖性较弱。这些激发与用来解释光电子发射中观察到的高能“扭结”的玻色子惊人地相似。基于角分辨光电子能谱导出的电子结构和Yang-Rice-Zhang准粒子的参数化的自旋响应唯象计算，提供了对观测到的磁激发的能量色散的合理预测。这些结果表明了一个可能的统一框架来协调铜酸盐的磁性和电子特性，我们讨论了这种方法的优点和缺点。 DOI：10.1103/PhysRevLett.110.147001
We investigate the high-energy magnetic excitation spectrum of the high-T-c cuprate superconductor Bi2Sr2CaCu2O8+delta (Bi-2212) using Cu L-3 edge resonant inelastic x-ray scattering. Broad, dispersive magnetic excitations are observed, with a zone boundary energy of similar to 300 meV and a weak dependence on doping. These excitations are strikingly similar to the bosons proposed to explain the high-energy "kink" observed in photoemission. A phenomenological calculation of the spin response, based on a parametrization of the the angle-resolved photoemission spectroscopy derived electronic structure and Yang-Rice-Zhang quasiparticles, provides a reasonable prediction of the energy dispersion of the observed magnetic excitations. These results indicate a possible unified framework to reconcile the magnetic and electronic properties of the cuprates and we discuss the advantages and disadvantages of such an approach. DOI: 10.1103/PhysRevLett.110.147001