论文标题
违反重费超导体cerh $ _2 $的违反Pauli-Clogston限制为$ _2 $ - 巡回和局部4F电子的二元性 -
Violation of the Pauli-Clogston limit in a heavy Fermion superconductor CeRh$_2$As$_2$ --Duality of itinerant and localized 4f electrons--
论文作者
论文摘要
从理论上讲，我们提出了一种理解上临界场h $ _ {\ rm c2} $的违反Pauli-Clogston限制的机制，该机制在CE带有重费用材料CERH $ _2 $ AS $ _2 $的CE中观察到了$ _2 $。它基于二元概念，即电子的双重同时方面：巡回部分和准粒子的局部部分（QPS）源自CE原子的4F电子。虽然巡回QP直接参与形成库珀对，但局部QP会发挥内部场，以通过它们之间的反铁磁交换相互作用反对所应用的场。这通常是密集的Kondo晶格系统所固有的。我们认为，这种机制不仅可以应用于本地非中心材料cerh $ _2 $作为$ _2 $，而且还可以应用于全球反转对称性损坏的CE基材料，例如CEPT $ _3 $ _3 $ SI。此外，我们指出，它还适用于Pauli限制违反Spin三胞胎配对系统，例如UTE $ _2 $。
We theoretically propose a mechanism to understand the violation of the Pauli-Clogston limit for the upper critical field H$_{\rm c2}$ observed in the Ce bearing heavy Fermion material CeRh$_2$As$_2$ from the view point of spin singlet pairing. It is based on a duality concept, the dual simultaneous aspects of an electron: the itinerant part and localized part of quasi-particles (QPs) originated from the 4f electrons of the Ce atoms. While the itinerant QPs directly participate in forming the Cooper pairs, the localized QPs exert the internal field so as to oppose the applied field through the antiferromagnetic exchange interaction between them. This is inherent in the dense Kondo lattice system in general. We argue that this mechanism can be applied not only to the locally noncentrosymmetric material CeRh$_2$As$_2$, but also to globally inversion symmetry broken Ce-based materials such as CePt$_3$Si. Moreover, we point out that it also works for strongly Pauli limit violated spin triplet pairing systems, such as UTe$_2$.
