Journal Article

PUBDB-2022-05379

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Tuneable electron–magnon coupling of ferromagnetic surface states in PdCoO$_2$

Mazzola, F. (Corresponding author) ; Yim, C. -. ; Sunko, V. ; Khim, S. ; Kushwaha, P. ; Clark, O. J. ; Bawden, L. ; Marković, I.Extern*EMBL* ; Chakraborti, D. ; Kim, T. K.Extern*XFEL.EU* ; Hoesch, M.DESY* ; Mackenzie, A. P. ; Wahl, P. ; King, P. D. C. (Corresponding author)

2022
Nature Publishing Group [London]

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Please use a persistent id in citations: doi:10.1038/s41535-022-00428-8  doi:10.3204/PUBDB-2022-05379

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 PdCoO$_2$, 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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Contributing Institute(s):

1. PETRA-S (FS-PETRA-S)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2022

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