论文标题
基于动量多物的波动引起的超导性
Superconductivity induced by fluctuations of momentum-based multipoles
论文作者
论文摘要
最近对非常规超导性的研究集中在电荷或自旋波动上，而不是电子偶联，这是电子之间有吸引力的相互作用的起源。另一方面，在密切相关和旋转轨道耦合系统中代表电子自由度的多极阶最近引起了很多关注。在这种背景的刺激下，我们研究了多极介导的超导性，这提出了一种非常规超导性的新配对机制。实际上，以前的作品表明，各向同性系统中奇数电量多极阶的波动引起的自旋三链球超导性。在这项研究中，我们在各向同性和晶体系统中都建立了所有多极对称性的多极介导的超导性的一般公式。结果，我们揭示了由奇数和/或高阶多极波动引起的各种各向异性配对，这些偏差超出了普通电荷或自旋波动。还讨论了由于机制而引起的拓扑超导性。根据获得的结果，我们讨论了掺杂的srtio $ _3 $，prti $ _2 $ al $ al $ _ {20} $，li $ _2 $（pd，pt，pt）$ _ 3 $ b，和磁性多对金属的非常规超导性。
Recent studies of unconventional superconductivity have focused on charge or spin fluctuation, instead of electron-phonon coupling, as an origin of attractive interaction between electrons. On the other hand, a multipole order, which represents electrons' degrees of freedom in strongly correlated and spin-orbit-coupled systems, has recently been attracting much attention. Stimulated by this background, we investigate multipole-fluctuation-mediated superconductivity, which proposes a new pairing mechanism of unconventional superconductivity. Indeed, previous works have shown spin-triplet superconductivity induced by fluctuations of odd-parity electric multipole orders in isotropic systems. In this study, we establish a general formulation of the multipole-fluctuation-mediated superconductivity for all multipole symmetries, in both isotropic and crystalline systems. As a result, we reveal various anisotropic pairings induced by odd-parity and/or higher-order multipole fluctuations, which are beyond the ordinary charge or spin fluctuations. Topological superconductivity due to the mechanism is also discussed. Based on the obtained results, we discuss unconventional superconductivity in doped SrTiO$_3$, PrTi$_2$Al$_{20}$, Li$_2$(Pd, Pt)$_3$B, and magnetic multipole metals.
