Bielefeld University & Helmholtz-Zentrum Berlin, Germany

报告摘要:

Magnetic refrigeration is considered one of the best alternatives to gas-compression based refrigeration due to its high efficiency and environmentally friendly materials. It relies on materials presenting strong magnetoelastic couplings which give rise to large reversible magneto- and baro-caloric adiabatic temperature and entropy changes observed around first order phase transitions. In these materials the phase transition can be triggered not only by temperature and field but also by pressure. On one hand the exchange interaction is a function of the interatomic distance, pressure offers a clean way of probing the nature of the magnetoelastic coupling.On the other hand it is also possible to explore magnetocaloric materials presenting first order phase transitions for their barocaloric properties. In this work I will report high pressure measurements of the magnetic and structural properties in several promising magnetocaloric materials systems such as Fe2P-based compounds, MnCoGe, Hf0.84Ta0.16Fe2 and NiMn-based Heusler alloys, and what we can learn from such experiments.

报告人简介：

Prof. Luana Caron has a Bachelor and a Ph.D. in Physics from the State University of Campinas and has worked as a post doc researcher at the Reactor Institute Delft - Delft University of Technology, Angström Laboratory at Uppsala University and at the Max Planck Institute for Chemical Physics of Solids. Since April 2018, Luana Caron is a Junior Professor at Bielefeld University as part of the Joint Lab BiBer of Bielefeld University and Helmholtz Center Berlin. Her research aims at understanding the coupling between different degrees of freedom which give rise to phenomena such as the caloric and multicaloric effects, magnetoresistance, shape memory, etc, with the ultimate goal of engineering novel functional magnetic materials.

联系人：胡凤霞 研究员 （8264 9233）