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Magnetic order in the iron pnictides and the impact of spin-orbit coupling

Date: 2018-06-06
Time: 10:30
Venue: Magnetic order in the iron pnictides and the impact of spin-orbit coupling
Speaker: Dr. Morten Christensen

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 [1]. I will argue that the concept of intertwined orders constitutes a unified framework within which to understand the impact of spin-orbit coupling [2] and how this influences the appearance of vestigial phases such as nematic order [3]. The spin-orbit coupling induces anisotropy in the magnetic fluctuations, locking the moment-direction with the direction of the ordering vector [4]. 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 [5].

Reference:
[1] Borisenko et al. Nat. Phys. 12, 311 (2016)
[2] MHC, J. Kang, B. M. Andersen, I. Eremin, and R. M. Fernandes, PRB 92, 214509 (2015)
[3] MHC, J. Kang, and R. M. Fernandes, to appear.
[4] MHC, P. P. Orth, B. M. Andersen, and R. M. Fernandes, arxiv: 1712.07192
[5] MHC, P. P. Orth, B. M. Andersen, and R. M. Fernandes, arxiv: 1712.07188

Host: Zi Yang Meng (9331)