Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 29: Caloric Effects in Magnetic Materials

MA 29.3: Talk

Thursday, September 8, 2022, 10:00–10:15, H47

Direct measurements of the adiabatic temperature change of holmium for cryogenic applications — •E. Bykov^1,2, T. Gottschall¹, Y. Skourski¹, C. Salazar Mejia¹, J. Wosnitza^1,2, M. D. Kuz’min³, Y. Mudryk⁴, D. L. Schlagel⁴, and V. Pecharsky^4,5 — ¹1Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — ²Technische Universität Dresden, Dresden, Germany — ³Aix-Marseille Université, IM2NP, Marseille, France — ⁴Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames,USA — ⁵Department of Materials Science and Engineering, Iowa State University, Ames, USA

Rare-earth elements and their intermetallic compounds are interesting candidate materials for magnetic cooling at and below room temperature. Holmium demonstrates one of the largest magnetic moment in the lanthanide series and possesses other unusual magnetic properties. This metal exhibits numerous magnetic phase transitions as the temperature and/or magnetic field vary. Its Néel temperature accounts for T_N = 132 K, and its Curie temperature is T_C = 20 K resulting in a strong magnetocaloric effect in a large temperature window. This fact makes holmium a promising single-stage refrigerator material in an AMR (active magnetic regenerator) scheme for the liquefaction of natural gas and hydrogen. In this work, we present a comprehensive analysis of the magnetocaloric effect in a holmium single crystal in high magnetic fields up to 60 T.