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  Tuneable electron-magnon coupling of ferromagnetic surface states in PdCoO2

Mazzola, F., Yim, C.-M., Sunko, V., Khim, S., Kushwaha, P., Clark, O. J., et al. (2022). Tuneable electron-magnon coupling of ferromagnetic surface states in PdCoO2. npj Quantum Materials, 7(1): 20, pp. 1-6. doi:10.1038/s41535-022-00428-8.

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 Creators:
Mazzola, F.1, Author
Yim, C-M1, Author
Sunko, V.2, Author              
Khim, S.2, Author              
Kushwaha, P.2, Author              
Clark, O. J.1, Author
Bawden, L.1, Author
Marković, I.2, Author              
Chakraborti, D.2, Author              
Kim, T. K.1, Author
Hoesch, M.1, Author
Mackenzie, A. P.3, Author              
Wahl, P.1, Author
King, P. D. C.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863463              

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 Abstract: Controlling 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 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 is enhanced sevenfold 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 light on electron-magnon interactions in solid-state materials, and the ways in which these can be controlled.

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Language(s): eng - English
 Dates: 2022-02-112022-02-11
 Publication Status: Published in print
 Pages: -
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Title: npj Quantum Materials
  Other : npj Quantum Mater.
Source Genre: Journal
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Publ. Info: [London] : Nature Publishing Group
Pages: - Volume / Issue: 7 (1) Sequence Number: 20 Start / End Page: 1 - 6 Identifier: ISSN: 2397-4648
CoNE: https://pure.mpg.de/cone/journals/resource/2397-4648