论文标题
BCS范式和探索高温超导体的经验规则之后的非常规超导性
Unconventional superconductivity after the BCS paradigm and empirical rules for the exploration of high temperature superconductors
论文作者
论文摘要
超导状态是通过库珀对的量子凝结来实现的，库珀对是正常金属中单个电子以外的新型电荷载体。 Bardeen-Cooper-Schrieffer（BCS）在1957年建立的理论可以成功解释许多单元素和合金超导体中超导性的现象。在BCS方案中，库珀对是通过在费米表面附近具有相反动量的两个电子之间交换晶格（声子）的虚拟振动来形成的。 BCS理论在64年内主导了超导性领域。然而，在过去的四十年中发现的许多超导体，例如重型费米昂超导体，酸辣酱，铁质剂/粉红色属植物和镍盐似乎强烈违反了BCS的图片。最重要的问题是，也许基于电子音波耦合的BCS图片是超导性的特殊情况，库珀配对和超导性的其他原因或路线也有很多。在这篇简短的概述论文中，我们将总结部分进展，并尝试指导读者在BCS范式之后的一些新的超导性方案。我们还提出了几种经验规则，以探索高温非常规超导体。
Superconducting state is achieved through quantum condensation of Cooper pairs which are new types of charge carriers other than single electrons in normal metals. The theory established by Bardeen-Cooper-Schrieffer (BCS) in 1957 can successfully explain the phenomenon of superconductivity in many single-element and alloy superconductors. Within the BCS scheme, the Cooper pairs are formed by exchanging the virtual vibrations of lattice (phonons) between two electrons with opposite momentum near the Fermi surface. The BCS theory has dominated the field of superconductivity over 64 years. Many superconductors discovered in past four decades, such as the heavy Fermion superconductors, cuprates, iron pnictide/chalcogenide and nickelates seem, however, to strongly violate the BCS picture. The most important issue is that, perhaps the BCS picture based on electron-phonon coupling are the special case for superconductivity, there are a lot of other reasons or routes for the Cooper pairing and superconductivity. In this short overview paper, we will summarize part of these progresses and try to guide readers to some new possible schemes of superconductivity after the BCS paradigm. We also propose several empirical rules for the exploration of high-temperature unconventional superconductors.
