铁基超导体中的磁振子介导对和同位素效应
Magnon-Mediated Pairing and Isotope Effect in Iron-based Superconductors
摘要：
在铁基超导体的一个极小模型中，其中巡游电子与一个局域磁矩带相互作用，我们得到了多带超导性的一般结论。在多带超导体中，由于阿德勒定理，在长波长极限处，带间散射主导带内散射，只要两种相互作用都是由戈德斯通玻色子（在我们的情况下是磁振子）引起的，并且转移的动量不为零。即使带内和带间相互作用是排斥的，这种相互作用也导致了著名的反方向超导。这种效应可以模拟为费米面之间的内部约瑟夫森链接。我们的模型也是符合最近发现的超导性和磁序铁磷属元素的共存。虽然实验观察到的同位素效应是大的，$α=0.4$，我们表明，它是一致的非声子机制中，它是同位素效应的结果在晶格常数的变化，因此零点运动的Fe原子。
英文摘要：
Within a minimal model for the iron-based superconductors in which itinerant electrons interact with a band of local moments, we derive a a general conclusion for multi-band superconductivity. In a multi-band superconductor, due to the Adler theorem, the inter-band scattering dominates the intra-band scattering at the long wave length limit as long as both interactions are induced by Goldstone boson (which is magnon in our case) and the transfered momentum is nonzero. Such kind of interaction leads to a well-known sigh-reversing superconductivity even if the inter-band and intra-band interaction are repulsive. This effect can be modeled as arising from an internal Josephson link between the Fermi surface sheets. Our model is also consistent with the recently discovered coexistence of superconductivity and magnetic order in iron-pnictides. Although the experimentally observed isotope effect is large, $α=0.4$, we show that it is consistent with a non-phononic mechanism in which it is the isotope effects result in a change in the lattice constant and as a consequence the zero-point motion of the Fe atoms.
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