Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 53: Poster Wednesday: Spins and Magnetism
O 53.3: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P4
Thermally-induced magnetic order from glassiness in elemental neodymium — •Benjamin Verlhac1, Lorena Niggli1, Anders Bergman2, 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
In thermodynamic systems, temperature is synonymous with disorder as phase transitions between order to disorder occur when temperature is increased. Recently, the first example of a spin-Q glass was found in elemental neodymium between 30mK and 4K(1). This phase originated from magnetic frustration within the dhcp lattice of neodymium.
In this study, we show by means of spin-polarized scanning tunneling microscopy that neodymium undergoes an unusual magnetic transition, where long range multi-Q order emerges from the spin-Q glass phase as temperature is increased from 5 K to 15 K(2). We also developed a new analysis method, which analyzes the experimental data and extracts the phase transition temperature.
These findings are supported by atomistic spin dynamics simulations, in which the phase transition is qualitatively explained by destroying spin frustration due to various exchange contributions of the different sublattices.
(1) Kamber, U. et al., Science 368 (2020)
(2) Verlhac, B. et al., arXiv:2109.04815