SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Poster Magnetism I

MA 23.19: Poster

Dienstag, 28. März 2023, 17:00–19:00, P1

Direct measurements of the adiabatic temperature change in heavy rare-earth RCo₂ compounds in high magnetic fields — •E. Bykov^1,2, T. Gottschall¹, K. Skokov³, A. Karpenkov³, W. Liu³, F. Scheibel³, O. Gutfleisch³, and J. Wosnitza^1,2 — ¹Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — ²Technische Universität Dresden, Dresden, Germany — ³Technische Universität Darmstadt, Darmstadt, Germany

Rare-earth elements and their intermetallic compounds are interesting candidate materials for magnetic cooling at and below room temperature. Although the group of heavy rare-earth Laves phases RM₂ (R is a rare earth, M a transition metal) is one of the most intensively investigated classes of magnetocaloric materials, data on directly determined adiabatic temperature changes are scarce. Continuing our work with ferromagnetic RNi₂ and RAl₂ compounds, we are now focussed on ferrimagnetic RCo₂. Some of them show complex magnetic behavior, such as metamagnetism at T_C, or an additional spin-reorientation transition and reduction of the Co magnetic moment below this temperature. In this work, we present a comprehensive analysis of the magnetocaloric effect in polycrystalline RCo₂ with R =  Er, Ho, Dy, and Tb in high magnetic fields up to 20 T.