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 .
 Borisenko et al. Nat. Phys. 12, 311 (2016)
 MHC, J. Kang, B. M. Andersen, I. Eremin, and R. M. Fernandes, PRB 92, 214509 (2015)
 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)