Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, CA 90095, USA.
J Phys Condens Matter. 2011 Jun 8;23(22):223201. doi: 10.1088/0953-8984/23/22/223201. Epub 2011 May 19.
Superconductivity in the iron pnictides and chalcogenides arises at the border of antiferromagnetism, which raises the question of the role of quantum criticality. In this topical review, we describe the theoretical work that led to the prediction of a magnetic quantum critical point arising out of a competition between electronic localization and itinerancy, and the proposal for accessing it by using isoelectronic P substitution for As in the undoped iron pnictides. We go on to compile the emerging experimental evidence in support of the existence of such a quantum critical point in isoelectronically tuned iron pnictides. We close by discussing the implications of these results for the physics of the iron pnictides and chalcogenides.
铁磷族和硫族化合物中的超导性出现在反铁磁边缘，这引发了量子临界点作用的问题。在本专题综述中，我们描述了理论工作，这些工作预测了由于电子局域化和巡游之间的竞争而产生的磁量子临界点，并提出了通过在未掺杂的铁磷族化合物中用等电子的 P 取代 As 来接近该临界点的建议。我们接着汇编了新兴的实验证据，以支持在等电子调谐的铁磷族化合物中存在这样的量子临界点。最后，我们讨论了这些结果对铁磷族和硫族化合物物理的影响。
