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Spin liquid mediated RKKY interaction

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Legg_2019_Spin_liquid_SciRep_17697_CC.pdf (2.000Mb)
Date
27/11/2019
Author
Legg, H. F.
Braunecker, Bernd
Keywords
QC Physics
TK Electrical engineering. Electronics Nuclear engineering
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Abstract
We propose an RKKY-type interaction that is mediated by a spin liquid. If a spin liquid exists such an interaction could leave a fingerprint by ordering underlying localised moments such as nuclear spins. This interaction has a unique phenomenology that is distinct from the RKKY interaction found in fermionic systems; most notably the lack of a Fermi surface and absence of the requirement for itinerant electrons, since most spin liquids are insulators. We demonstrate that the interaction is predominately shaped by the lattice symmetries of the underlying spin liquid. As a working example we investigate the possible ordering of nuclear spins that interact through an underlying lattice of the two-dimensional spin-1/2 kagome antiferromagnet (KHAF), although the treatment remains general and can be extended to other spin liquids and dimensions. We find that several different nuclear spin orderings minimise the RKKY-type energy induced by the KHAF but are unstable due to a zero-energy flat magnon band in linear spin-wave theory. Despite this we show that a small magnetic field is able to gap out this magnon spectrum resulting in an intricate nuclear magnetism.
Citation
Legg , H F & Braunecker , B 2019 , ' Spin liquid mediated RKKY interaction ' , Scientific Reports , vol. 9 , 17697 , pp. 1-12 . https://doi.org/10.1038/s41598-019-53842-7
Publication
Scientific Reports
Status
Peer reviewed
DOI
https://doi.org/10.1038/s41598-019-53842-7
ISSN
2045-2322
Type
Journal article
Rights
© The Author(s) 2019. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Description
Funding: DFG under CRC 1238 and Bonn-Cologne Graduate School of Physics and Astronomy (BCGS).
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/19011

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