Itinerant spin fluctuations in iron-based superconductors
Abstract
Multiband systems, which possess a wide parameter space, allow to explore a variety of competing ground states. Bright examples are the Fe-based pnictides and chalcogenides, which demonstrate metallic, superconducting, and various magnetic phases. Here I discuss only one of the many interesting topics, namely, spin fluctuations in metallic multiband systems. I show how to calculate the effect of itinerant spin excitations on the electronic properties and formulate a theory of spin fluctuation-induced superconductivity. The superconducting state is unconventional and thus the system demonstrates unusual spin response with the spin resonance feature. I discuss its origin, consequences, and relation to experimental observations. Role of the spin-orbit coupling is specifically emphasized.
Cite
@article{arxiv.1710.09888,
title = {Itinerant spin fluctuations in iron-based superconductors},
author = {Maxim M. Korshunov},
journal= {arXiv preprint arXiv:1710.09888},
year = {2018}
}
Comments
61 pages, chapter in the book "Perturbation Theory: Advances in Research and Applications"