Failure of the Maxwell relation for the quantification of caloric effects in ferroic materials

Details Failure of the Maxwell relation for the quantification of caloric effects in ferroic materials Failure of the Maxwell relation for the quantification of caloric effects in ferroic materials

2011-10-17

arxiv.org/abs/1110.3617v1

Physics

Condensed Matter

Materials Science

8 pages, 4 figures

Scientific paper

Giant caloric effects were reported in elasto-, electro- and magnetocaloric materials near phase transformations. Commonly, their entropy change is indirectly evaluated by a Maxwell relation. We report the fundamental failure of this approach. We analyze exemplarily the Ni-Mn-Ga magnetic shape memory alloy. An applied field results in magnetically induced reorientation of martensitic variants, which form during the phase transformation. This results in a spurious magnetocaloric effect, which only disappears when repeating the measurement a second time. This failure is universal as the vector character of the applied field is not considered in the common scalar evaluation of a Maxwell relation.

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