Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 30: Surface Magnetism
MA 30.5: Vortrag
Donnerstag, 8. September 2022, 10:30–10:45, H48
Thermally-induced magnetic order from glassiness in elemental neodymium — Benjamin Verlhac1, •Lorena Niggli1, Anders Bergmann2, Umut Kamber1, Andrey Bagrov1,2, Diana Iuşan2, Lars Nordström2, Mikhail I. Katsnelson1, Daniel Wegner1, Olle Eriksson2,3, and Alexander A. Khajetoorians1 — 1Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands — 2Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden — 3School of Science and Technology, Örebro University, SE-701 82 Örebro, Sweden
While traditional spin glasses are characterized by randomness and frustration, elemental neodymium shows glassy behavior as a result of competing interactions, particularily without extrinsic disorder [1]. Adding to the list of intriguing effects found in spin glasses, e.g. aging and memory, we observe an unconventional magnetic phase transition from a glassy to a long-range ordered phase in Nd as temperature is increased [2]. To characterize the spatially varying magnetization patterns, we employ temperature-dependent spin-polarized scanning tunnelling microscopy between 5-15K along with atomistic spin dynamics simulations that support our findings. A new analysis method allows us to extract the phase transition temperature directly by evaluating our experimental data. Notably, such an unusual magnetic phase transition serves as a counterexample to the common thermodynamic understanding of temperature and disorder being synonymous.
[1] U. Kamber et al., Science 368 (2020).
[2] B. Verlhac et al., arXiv:2109.04815, accepted at Nat. Phys.