论文标题
充电和旋转波动的相互作用在洪巴的耦合杂质中
Interplay of charge and spin fluctuations in a Hund's coupled impurity
论文作者
论文摘要
在Hund的金属中，轨道之间的局部铁磁相互作用导致复杂的电子状态的出现，具有较大且缓慢波动的磁矩。引入了Hund的混合价量子杂质，我们获得了分析性的洞察力。我们表明，价波动在很大程度上阻碍了在广泛的温度和能量中的巨大波动时刻的发展，其特征是淬火的轨道自由度和自旋易感性$χ_ {\ rm sp}'（ω）'（ω）\ propto [em/t_m/t_m/t_m/t_m/t_m/t_m/t_的旋转易感性行为eff}）^2]^{ - 1} $，非常类似于幂律缩放$χ_ {\ rm sp}''（ω）\ simω^{ - γ} $。怀疑这种奇异的自旋波动在未来的Hund驱动库珀配对的未来模型中起着重要作用。
In Hund's metals, the local ferromagnetic interaction between orbitals leads to an emergence of complex electronic states with large and slowly fluctuating magnetic moments. Introducing the Hund's coupled mixed valence quantum impurity, we gain analytic insight into recent numerical renormalization group studies. We show that valence fluctuations drastically impede the development of a large fluctuating moment over a wide range of temperatures and energy, characterized by quenched orbital degrees of freedom and a singular logarithmic behavior of the spin susceptibility $χ_{\rm sp}''(ω) \propto [ω\ln(ω/T_K^{\rm eff})^2]^{-1}$, closely resembling power-law scaling $χ_{\rm sp}''(ω) \sim ω^{-γ}$. Such singular spin fluctuations are suspected to play an important role in future models of Hund's driven Cooper pairing.
