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MA: Fachverband Magnetismus

MA 18: Caloric Effects in Ferromagnetic Materials (joint session MA/TT)

MA 18.5: Vortrag

Dienstag, 10. März 2026, 10:45–11:00, POT/0151

Pressure effect on the magnetocaloric response of RCo₂ Laves Phases — •Catalina Salazar-Mejia¹, E. Bykov¹, W. Liu², K. Skokov², O. Gutfleisch², J. Wosnitza^1,3, and T. Gottschall¹ — ¹High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Germany — ²Institut für Materialwissenschaft, TU Darmstadt, Germany — ³Institut für Festkörper- und Materialphysik, TU Dresden, Germany

Rare-earth Laves phases are potential candidates for magnetic refrigeration at cryogenic temperatures. They exhibit large magnetocaloric effects and their transition temperatures can be tuned through elemental substitutions. In this work, we investigate the effect of hydrostatic pressure on the magnetism and magnetocaloric effect of RCo₂ Laves phases with rare-earth elements R = Tb, Dy, Ho, and Er. In general, we observe that the Curie temperature, T_C, decreases with applied pressure in all alloys. T_C is most sensitive to pressure in TbCo₂, with dT_C/dp ≈ −22 K/GPa, and this value decreases systematically along the series, reaching dT_C/dp ≈ −7.7 K/GPa in ErCo₂. More interestingly, hydrostatic pressure has an almost negligible effect on the magnetocaloric response - specifically on the isothermal entropy change, Δ S_T, with the exception of HoCo₂, where Δ S_T increases by about 26% under an applied pressure of approximately 1 GPa and for a magnetic field change of 5 T.

Keywords: Magnetocaloric Effect; Applied Pressure; Laves Phases