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Title: Helical structures in layered magnetic superconductors due to indirect exchange interactions mediated by interlayer tunneling

Journal Article · · Physical Review B

Motivated by the recent discovery of helical magnetic structure in RbEuFe4As4, we investigate interlayer ordering of magnetic moments in materials composed of spatially separated superconducting and ferromagnetically aligned layers. We consider the interplay between the normal and superconducting indirect exchange interactions mediated by tunneling between the conducting layers. We elaborate a recipe to evaluate the normal interlayer interaction via two-dimensional density of states of an isolated layer and demonstrate that for bands with small fillings, such interaction is typically ferromagnetic and short range. The nearest-layer interaction is proportional to the ratio of the interlayer hopping and in-plane bandwidth squared. On the other hand, the superconducting contribution always gives antiferromagnetic interaction and may extend over several layers when the interlayer hopping energy exceeds the superconducting gap. The frustration caused by the interplay between the normal and superconducting parts may lead to spiral ground-state magnetic configuration. Finally, the fourfold in-plane anisotropy may lock the rotation angle between the moments in the neighboring layers to 90 degrees, as it was observed in RbEuFe4As4.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1580740
Journal Information:
Physical Review B, Vol. 100, Issue 22; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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