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TT: Fachverband Tiefe Temperaturen

TT 4: f-Electron Systems

TT 4.2: Talk

Monday, March 18, 2024, 10:00–10:15, H 3005

Inelastic neutron scattering of single-crystal ErB₂ — Michal Stekiel¹, •Christoph Resch², Andreas Bauer², Karin Schmalzl³, Jakob Lass⁴, Astrid Schneidewind¹, and Christian Pfleiderer^2,5,6,7 — ¹Jülich Centre for Neutron Science, Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85747 Garching, Germany — ²TUM School of Natural Sciences, Physik Department 85748 Garching, Germany — ³Institut Laue-Langevin, 38042 Grenoble Cedex 9, France — ⁴Paul Scherrer Institute, 5232 Villigen PSI, Switzerland — ⁵Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, D-85748 Garching, Germany — ⁶Zentrum für Quantum Engineering (ZQE), Technische Universität München, D-85748 Garching, Germany — ⁷Munich Center for Quantum Science and Technology (MCQST), Technische Universität München, D-85748 Garching, Germany

We present inelastic neutron scattering data on the hexagonal rare-earth diboride ErB₂. Previous neutron Laue and single-crystal diffraction together with measurements of the magnetic and electrical bulk properties consistently established the magnetic ground state to be an easy-plane ferromagnet with strong magnetocrystalline anisotropies [1]. We studied the magnetic excitation spectrum as a function of magnetic field by means of multiplexing triple-axis spectroscopy. We interpret the observed spectra to be consistent with a strong easy-plane ferromagnet. Additional anomalous features may be explained in the context of strong magnon-phonon-coupling.

[1] C. Resch, unpublished

Keywords: Diborides; Magnons; Phonons; Ferromagnetism; Neutron Scattering