Magnetic order in the iron pnictides and the impact of spin-orbit coupling
University of Minnesota
Abstract: The iron-based superconductors represent a new family of unconventional superconductors in which superconductivity appears in close proximity to a magnetically ordered phase. After a brief review of iron-based superconductors, I will discuss the different magnetic orders observed in experiments, with emphasis on the influence of spin-orbit coupling . I will argue that the concept of intertwined orders constitutes a unified framework within which to understand the impact of spin-orbit coupling  and how this influences the appearance of vestigial phases such as nematic order . The spin-orbit coupling induces anisotropy in the magnetic fluctuations, locking the moment-direction with the direction of the ordering vector . In the vicinity of a magnetic quantum critical point this has important consequences, and leads to an emergence of magnetic degeneracy and the possible proliferation of magnetic phases .
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 MHC, J. Kang, and R. M. Fernandes, to appear.
 MHC, P. P. Orth, B. M. Andersen, and R. M. Fernandes, arxiv: 1712.07192
 MHC, P. P. Orth, B. M. Andersen, and R. M. Fernandes, arxiv: 1712.07188
Host: Zi Yang Meng (9331)