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arXiv · 1710.09888

Itinerant spin fluctuations in iron-based superconductors

Maxim M. Korshunov
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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.

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Maxim M. Korshunov. 2017-10-26. Itinerant spin fluctuations in iron-based superconductors. https://arxiv.org/abs/1710.09888

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