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MA: Fachverband Magnetismus

MA 51: Caloric Effects in Ferromagnetic Materials

MA 51.13: Vortrag

Freitag, 22. März 2024, 13:00–13:15, H 2013

Influence of hydrostatic pressure on the magnetocaloric effect of La0.7Ce0.3Fe11.6Si1.4 — •Benedikt Beckmann¹, Lukas Pfeuffer¹, Johanna Lill², Benedikt Eggert², David Koch¹, Barbara Lavina^3,4, Jiyong Zhao⁴, Thomas Toellner⁴, Esen E. Alp⁴, Katharina Ollefs², Konstantin P. Skokov¹, Heiko Wende², and Oliver Gutfleisch¹ — ¹Institute of Materials Science, TU Darmstadt, Darmstadt, Germany — ²Faculty of Physics and CENIDE, UDE, Duisburg, Germany — ³Center for Advanced Radiation Sources, UChicago, Chicago, USA — ⁴Advanced Photon Source, Argonne National Laboratory, Argonne, USA

Magnetocaloric liquefaction of hydrogen, which is a key enabler for the successful transition towards a carbon neutral society based on renewable energies, is a crucial and promising future technology. However, the current dependence on highly-critical, heavy rare-earth based magnetocaloric materials is a major disadvantage for the global usage of the technology. In this work, we aim to mitigate this limitation by using a multi-stimuli approach, utilizing isotropic pressure and magnetic field as external stimuli to tailor and induce the phase transition associated with a large caloric effect. We use non-toxic, low-cost, and low-criticality La0.7Ce0.3Fe11.6Si1.4, achieving phase transitions in the temperature range from 200 K down to liquid hydrogen temperatures with large isothermal entropy changes up to 28 J(kgK)^-1.

We acknowledge financial support from DFG through CRC 270 HoMMage (Project-ID 405553726) and thank the Argonne National Laboratory for allocating beamtime.

Keywords: Phase transitions; La(Fe,Si)13; Multicaloric; Gas liquefaction