论文标题
重新进入$ s $ - 在周期性的安德森模型中具有吸引人的传导乐队Hubbard互动的超导性
Reentrant $s$-wave superconductivity in the periodic Anderson model with attractive conduction band Hubbard interaction
论文作者
论文摘要
磁性杂质的自旋叉散射在$ S $ - 波超导体中具有强大的成对效果，在$ s $ wave的超导体中，增加杂质的浓度会迅速破坏超导性。对于小近托温度$ t_k $，超导性的破坏是在有限温度范围内的重新进入超导率$ t_ {c2} <t <t <t <t <t <t <t <t <t <t <t <t <t <t <t <t_ {c2}} \ sim t_k $。在这里，我们在以安德森晶格为模型的周期系统中探索了超导阶段，该系统具有其他有吸引力的现场（Hubbard）相互作用$ G $，该相互作用$ g $作用于传导带电子。我们使用融合亲物理的动态平均场理论求解方程，而配对相互作用在静态均值场水平上进行处理。对于大型耦合$ g $，我们发现重进入超导性，类似于稀释的杂质。但是，我们发现有证据表明，重进入超导性并不是导致近距效应的多体相关性的结果，而是源于单粒子杂交和超导配对之间的竞争。从间隙结构中对光谱函数的洞察力是从近似非互动双模型获得的，该模型在几个精确限制之间插值。
Spin-flip scattering from magnetic impurities has a strong pair-breaking effect in $s$-wave superconductors where increasing the concentration of impurities rapidly destroys superconductivity. For small Kondo temperature $T_K$ the destruction of superconductivity is preceded by the reentrant superconductivity at finite temperature range $T_{c2} < T < T_{c1}$, while the normal phase reappears at $T<T_{c2} \sim T_K$. Here we explore the superconducting phase in a periodic system modeled as the Anderson lattice with additional attractive on-site (Hubbard) interaction $g$ acting on the conduction band electrons. We solve the equations using dynamical mean field theory which incorporates Kondo physics, while the pairing interaction is treated on the static mean-field level. For large coupling $g$ we find reentrant superconductivity which resembles the case with diluted impurities. However, we find evidence that reentrant superconductivity is here not a consequence of many-body correlations leading to the Kondo effect, but it rather stems from a competition between the single-particle hybridization and superconducting pairing. An insight into the spectral functions with in-gap structures is obtained from an approximate noninteracting dual model whose solution interpolates between several exact limits.
