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dc.contributor.authorMazzola, Federico
dc.contributor.authorYim, Chi-Ming
dc.contributor.authorSunko, Veronika
dc.contributor.authorKhim, Seunghyun
dc.contributor.authorKushwaha, Pallavi
dc.contributor.authorClark, Oliver J.
dc.contributor.authorBawden, Lewis
dc.contributor.authorMarković, Igor
dc.contributor.authorChakraborti, Dibyashree
dc.contributor.authorKim, Timur K.
dc.contributor.authorHoesch, Moritz
dc.contributor.authorMackenzie, Andrew P.
dc.contributor.authorWahl, Peter
dc.contributor.authorKing, Philip D. C.
dc.identifier.citationMazzola , F , Yim , C-M , Sunko , V , Khim , S , Kushwaha , P , Clark , O J , Bawden , L , Marković , I , Chakraborti , D , Kim , T K , Hoesch , M , Mackenzie , A P , Wahl , P & King , P D C 2022 , ' Tuneable electron-magnon coupling of ferromagnetic surface states in PdCoO 2 ' , npj Quantum Materials , vol. 7 , 20 .
dc.identifier.otherPURE: 277617005
dc.identifier.otherPURE UUID: e270bda7-0723-4168-8ebd-6313de93fcf4
dc.identifier.otherORCID: /0000-0002-8635-1519/work/108508607
dc.identifier.otherScopus: 85124959406
dc.identifier.otherWOS: 000754196500001
dc.descriptionFunding: We gratefully acknowledge support from the European Research Council (through the QUESTDO project, 714193), the Royal Society, the Max Planck Society, and the UKRI Engineering and Physical Sciences Research Council (Grant No. EP/S005005/1). V.S., O.J.C., and L.B. acknowledge the EPSRC for PhD studentship support through Grants EP/L015110/1, EP/K503162/1, and EP/G03673X/1, respectively. I.M. and D.C. acknowledge studentship support from the International Max-Planck Research School for Chemistry and Physics of Quantum Materials.en
dc.description.abstractControlling spin wave excitations in magnetic materials underpins the burgeoning field of magnonics. Yet, little is known about how magnons interact with the conduction electrons of itinerant magnets, or how this interplay can be controlled. Via a surface-sensitive spectroscopic approach, we demonstrate a strong and highly-tuneable electron-magnon coupling at the Pd-terminated surface of the delafossite oxide PdCoO2, where a polar surface charge mediates a Stoner transition to itinerant surface ferromagnetism. We show how the coupling can be enhanced 7-fold with increasing surface disorder, and concomitant charge carrier doping, becoming sufficiently strong to drive the system into a polaronic regime, accompanied by a significant quasiparticle mass enhancement. Our study thus sheds new light on electron-magnon interactions in solid-state materials, and the ways in which these can be controlled.
dc.relation.ispartofnpj Quantum Materialsen
dc.rightsCopyright © The Author(s) 2022. 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, unlessb 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.en
dc.subjectQC Physicsen
dc.subjectTK Electrical engineering. Electronics Nuclear engineeringen
dc.titleTuneable electron-magnon coupling of ferromagnetic surface states in PdCoO2en
dc.typeJournal articleen
dc.contributor.sponsorThe Royal Societyen
dc.contributor.sponsorEuropean Research Councilen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Centre for Designer Quantum Materialsen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.description.statusPeer revieweden

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