Dresden 2026 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 89: Cryotechnique: Refrigeration
TT 89.2: Talk
Thursday, March 12, 2026, 17:00–17:15, HSZ/0103
Adiabatic demagnetization refrigeration to below 100 mK with frustrated Gd3+ compounds — •Tim Treu, Marvin Klinger, Felix Kreisberger, Anton Jesche, and Philipp Gegenwart — Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg
Adiabatic demagnetization refrigeration (ADR) is becoming increasingly important for achieving temperatures below 1 K as the global supply of helium-3 continues to tighten. Although ADR in this temperature range has long relied on paramagnetic hydrated salts, recent work shows that frustrated rare-earth oxides provide greater entropy densities and practical benefits, particularly their stability against heating and vacuum exposure [1]. In this study, we present the structural, magnetic, and thermodynamic characteristics of frustrated Gd3+ compounds. We evaluate their excellent ADR performance to below 100 mK and compare the results with existing literature. Also, we demonstrate on these compounds how the ADR measurement itself can be used to gain information about the heat capacity, phase transitions, phase boundaries and magnetic interactions below 3He temperatures.
The work was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research 298
Foundation), Grants No. 514162746 (GE 1640/11-1) and No. TRR 360-492547816.
[1] T. Treu et al., J. Phys. Condens. Matter 37, 013001 (2025).
Keywords: adiabatic demagnetization refrigeration; magnetocaloric effect; magnetic frustration; magnetic order; sub-Kelvin temperature