Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 22: Caloric Effects in Ferromagnetic Materials
MA 22.1: Vortrag
Mittwoch, 19. März 2025, 09:30–09:45, H19
Utilizing frustration in Gd- and Yb-based oxides for milli-Kelvin adiabatic demagnetization refrigeration — •Tim Treu1, Prachi Telang1, Marvin Klinger1, Alexander Tsirlin2, Anton Jesche1, and Philipp Gegenwart1 — 1Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg — 2Felix Bloch Institute for Solid-State Physics, University of Leipzig
Gadolinium- and Ytterbium-oxide based frustrated magnets have recently been characterised as excellent millikelvin adiabatic demagnetization refrigerants [1]. They offer several advantages over conventional paramagnetic hydrated salts, such as higher entropy density at similar minimum temperatures, chemical stability and UHV compatibility. We present a comprehensive study of the structural, magnetic and thermodynamic properties as well as the adiabatic demagnetisation refrigeration performance of several different Gd- and Yb-based oxides (including [1-2] and further unpublished results). For the temperature range between 0.03 and 2 K, a systematic comparison of the field-induced entropy density change and the refrigerant capacity is provided, demonstrating the advantages of frustrated magnets for low-temperature ADR.
Work supported by the German Research Foundation through the project 514162746 (GE 1640/11-1).
[1] T. Treu et al., J. Phys. Condens. Matter 37, 013001 (2025).
[2] P. Telang et al., arXiv:2411.04805
Keywords: Adiabatic demagnetization refrigeration; Sub-Kelvin temperature; Magnetocaloric effect; Magnetic order