论文标题
突出的准分子杂物晶格中的光学和磁激发
Optical and magnetic excitations in the underscreened quasi-quartet Kondo lattice
论文作者
论文摘要
由单个两倍的退化传导带和CEF拆分4F电子准分子的围栏晶格的杂物晶格具有从约束均值场理论获得的非规定准粒子分散体。在上下杂交带的主要杂交带隙中发现了一个真正的重带，其较重的有效质量由CEF分裂控制。它的存在应深刻影响动力学光学和磁反应函数。在前者中，光学电导率的发作不是主要的杂交能量，而是较低的近代能量量表，它在直接过渡到其他重带中出现。动态磁反应也通过间隙重带进行了强烈修改，这可能导致非常规的谐振激发，可以解释为相干的CEF-Kondo晶格磁性激子。它们在低温下的不稳定性表示在突出的近代晶状体中引起的激发磁力的发作。
The underscreened Kondo lattice consisting of a single twofold degenerate conduction band and a CEF split 4f-electron quasi-quartet has non-conventional quasiparticle dispersions obtained from the constrained mean-field theory. An additional genuinely heavy band is found in the main hybridization band gap of the upper and lower hybridzed bands whose heavy effective mass is controlled by the CEF splitting. Its presence should profoundly influence the dynamical optical and magnetic response functions. In the former, the onset of the optical conductivity is not the main hybridisation energy but the much lower Kondo energy scale which appears in the direct transitions to the additional heavy band. The dynamical magnetic response is also strongly modified by the in-gap heavy band which can lead to unconventional resonant excitations that may be interpreted as coherent CEF-Kondo lattice magnetic exciton bands. Their instability at low temperature signifies the onset of induced excitonic magnetism in the underscreened Kondo lattice.
