Kink far below the Fermi level reveals new electron-magnon scattering channel in Fe

E. Młyńczak (), M. C. T. D. Müller, P. Gospodarič, T. Heider, I. Aguilera, G. Bihlmayer, M. Gehlmann, M. Jugovac, G. Zamborlini, C. Tusche, S. Suga, V. Feyer, L. Plucinski, C. Friedrich, S. Blügel and C. M. Schneider
Additional contact information
E. Młyńczak: Peter Grünberg Institut, Forschungszentrum Jülich and JARA
M. C. T. D. Müller: Peter Grünberg Institut, Forschungszentrum Jülich and JARA
P. Gospodarič: Peter Grünberg Institut, Forschungszentrum Jülich and JARA
T. Heider: Peter Grünberg Institut, Forschungszentrum Jülich and JARA
I. Aguilera: Peter Grünberg Institut, Forschungszentrum Jülich and JARA
G. Bihlmayer: Peter Grünberg Institut, Forschungszentrum Jülich and JARA
M. Gehlmann: Peter Grünberg Institut, Forschungszentrum Jülich and JARA
M. Jugovac: Peter Grünberg Institut, Forschungszentrum Jülich and JARA
G. Zamborlini: Peter Grünberg Institut, Forschungszentrum Jülich and JARA
C. Tusche: Peter Grünberg Institut, Forschungszentrum Jülich and JARA
S. Suga: Peter Grünberg Institut, Forschungszentrum Jülich and JARA
V. Feyer: Peter Grünberg Institut, Forschungszentrum Jülich and JARA
L. Plucinski: Peter Grünberg Institut, Forschungszentrum Jülich and JARA
C. Friedrich: Peter Grünberg Institut, Forschungszentrum Jülich and JARA
S. Blügel: Peter Grünberg Institut, Forschungszentrum Jülich and JARA
C. M. Schneider: Peter Grünberg Institut, Forschungszentrum Jülich and JARA

Nature Communications, 2019, vol. 10, issue 1, 1-5

Abstract: Abstract Many properties of real materials can be modeled using ab initio methods within a single-particle picture. However, for an accurate theoretical treatment of excited states, it is necessary to describe electron-electron correlations including interactions with bosons: phonons, plasmons, or magnons. In this work, by comparing spin- and momentum-resolved photoemission spectroscopy measurements to many-body calculations carried out with a newly developed first-principles method, we show that a kink in the electronic band dispersion of a ferromagnetic material can occur at much deeper binding energies than expected (Eb = 1.5 eV). We demonstrate that the observed spectral signature reflects the formation of a many-body state that includes a photohole bound to a coherent superposition of renormalized spin-flip excitations. The existence of such a many-body state sheds new light on the physics of the electron-magnon interaction which is essential in fields such as spintronics and Fe-based superconductivity.

Date: 2019
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DOI: 10.1038/s41467-019-08445-1

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