Events

Seminar of International Laboratory of High Magnetic Fields and Low Temperatures PAS

High magnetic field dependence of the magnetocaloric parameters in second-order magnetic transition Laves phase compounds

dr hab. Jacek Ćwik

MLSPMiNT PAN

The theoretical and experimental investigations of the magnetocaloric potentials in second-order magnetic phase transitions materials will be presented. The high magnetic field dependences of the adiabatic temperature change ΔT_ad and magnetic entropy change ΔS_mag in low temperature range were studied experimentally by the use of both direct and indirect methods. The experimental data was confronted with theoretical results based on a microscopic model Hamiltonian that includes the Zeeman-exchange magnetic interactions and the crystalline electrical-field anisotropy. The experimental data around the phase transition will be also discussed in the framework of the Landau theory of the second-order phase transitions.