Experimental evidence for Zeeman spin–orbit coupling in layered antiferromagnetic conductors

Most of solid-state spin physics arising from spin–orbit coupling, from fundamental phenomena to industrial applications, relies on symmetry-protected degeneracies. So does the Zeeman spin–orbit coupling, expected to manifest itself in a wide range of antiferromagnetic conductors. Yet, experimental...

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Bibliographic Details
Published in:npj quantum materials 2021-02, Vol.6 (1), p.1-7, Article 11
Main Authors: Ramazashvili, R., Grigoriev, P. D., Helm, T., Kollmannsberger, F., Kunz, M., Biberacher, W., Kampert, E., Fujiwara, H., Erb, A., Wosnitza, J., Gross, R., Kartsovnik, M. V.
Format: Article
Language:English
Subjects:
639/301/119/995
639/766/119/995
Antiferromagnetism
Condensed Matter
Condensed Matter Physics
Conductors
Electron spin
Industrial applications
Modulation
Organic superconductors
Physics
Physics and Astronomy
Quantum Physics
Spin-orbit interactions
Strongly Correlated Electrons
Structural Materials
Surfaces and Interfaces
Thin Films
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Summary:Most of solid-state spin physics arising from spin–orbit coupling, from fundamental phenomena to industrial applications, relies on symmetry-protected degeneracies. So does the Zeeman spin–orbit coupling, expected to manifest itself in a wide range of antiferromagnetic conductors. Yet, experimental proof of this phenomenon has been lacking. Here we demonstrate that the Néel state of the layered organic superconductor κ -(BETS) 2 FeBr 4 shows no spin modulation of the Shubnikov–de Haas oscillations, contrary to its paramagnetic state. This is unambiguous evidence for the spin degeneracy of Landau levels, a direct manifestation of the Zeeman spin–orbit coupling. Likewise, we show that spin modulation is absent in electron-doped Nd 1.85 Ce 0.15 CuO 4 , which evidences the presence of Néel order in this cuprate superconductor even at optimal doping. Obtained on two very different materials, our results demonstrate the generic character of the Zeeman spin–orbit coupling.
ISSN:2397-4648
2397-4648
DOI:10.1038/s41535-021-00309-6