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TT: Fachverband Tiefe Temperaturen
TT 25: f-Electron Systems
TT 25.9: Vortrag
Dienstag, 10. März 2026, 11:45–12:00, HSZ/0101
Antiferromagnetic order and spin excitations in HoInCu4 — •O. Stockert1, X. Boraley2, J. Lass2, R. Sibille2, Ø. S. Fjellvåg2,3, S. Moody2, A. M. Läuchli2,4, V. Fritsch5, and D. G. Mazzone2 — 1Max-Planck-Institut CPfS, Dresden — 2Paul-Scherrer-Institut, Villigen, Switzerland — 3Institute for Energy Technology, Kjeller, Norway — 4École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland — 5Universität Augsburg, Augsburg
Magnetic frustration quite often leads to novel quantum phases in condensed matter physics. Here, we focus on the intermetallic compound HoInCu4 with a face-centered cubic structure being prone to frustration.
We performed extensive elastic and inelastic neutron scattering on HoInCu4 to unravel the magnetic structure and to study the underlying exchange interactions [1,2]. Below 0.76 K HoInCu4 orders in a type-III AF structure with a reduced ordered moment and partially disordered Ho spins. Enhanced spin fluctuations due to frustration are detected as a diffuse signal, even well inside the ordered state. In the magnetic field polarized state the spin excitations and the magnetic diffuse scattering can be well modeled using linear spin-wave theory yielding a consistent set of nearest and next-nearest neighbor interactions. In contrast, in zero magnetic field spin-wave theory fully fails to describe the overdamped spin excitations in the AF ordered state. All these findings emphasize the importance of frustration in HoInCu4.
[1] O. Stockert et al., Phys. Rev. Res. 2, 013183 (2020).
[2] X. Boraley et al., Phys. Rev. Lett. 135, 046702 (2025).
Keywords: 4f based intermetallics; magnetic frustration; neutron scattering; magnetic order; magnetic excitations