The mutual influence of the conduction electron system provided by organic donor layers and magnetic system localized in insulating layers of the molecular charge transfer salt κ-(BETS)2FeBr4 has been studied. It is demonstrated that besides the high-field re-entrant superconducting state, the interaction between the two systems plays important role for the low-field superconductivity. The coupling of normal-state charge carriers to the magnetic system is reflected in magnetic quantum oscillations and can be evaluated based on the angle-dependent beating behaviour of the oscillations. On the other hand, the conduction electrons have their impact on the magnetic system, which is revealed through the pressure-induced changes of the magnetic phase diagram of the material.
@article{arxiv.1608.03490,
title = {Interplay between conducting and magnetic systems in the antiferromagnetic organic superconductor $\kappa$-(BETS)$_2$FeBr$_4$},
author = {Mark. V. Kartsovnik and Michael Kunz and Ludwig Schaidhammer and Florian Kollmannsberger and Werner Biberacher and Natalia D. Kushch and Akira Miyazaki and Hideki Fujiwara},
journal= {arXiv preprint arXiv:1608.03490},
year = {2018}
}