Regensburg 2016 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 5: SYCE: Caloric effects in ferroic materials (MM with MA, DF)

DF 5.1: Hauptvortrag

Montag, 7. März 2016, 15:00–15:30, H1

Multicaloric effects in metamagnetic Heusler materials — •Antoni Planes — Departament d'Estructura i Constituents de la Matèria. Facultat de Física. Universitat de Barcelona. Diagonal 647. 08028 Barcelona. Catalonia.

The talk is aimed at presenting a general thermodynamic framework to deal with multicaloric effects in multiferroic materials. After discussing a number of recently reported examples showing that various caloric effects may occur in the same material interdependently, the formalism will be applied to the study of mulicaloric effects taking place near the magnetostructural transition in metamagnetic Heusler shape-memory materials. This class of metamagnetic materials will be modelled by means of a Landau free energy expansion with appropriate interplay between the corresponding structural and magnetic order parameters. Caloric effects will be quantified by the isothermal entropy changes and the adiabatic temperature changes induced by application of the fields thermodynamically conjugated to the order parameters. It will be shown that multicaloric effects comprise the corresponding contributions from the effects associated with each ferroic property and the cross-contribution arising from the interplay between these properties. Finally, the obtained results will be compared with available experimental data.