Journal or Book Title
Applied Physics Letters
Depending on the starting equilibrium temperature, the application of a magnetic field on a sample of Ni–Mn–Sn produces sample heating or cooling during adiabatic experiments. The competition between endothermal and exothermal effects is observed close to the martensite-to-austenite magnetostructural phase transition. A model assuming the coexistence of two phases and a field dependence of their volume allows to compute the evolution of entropy and heat capacity during the phase transition. The correct fitting of the results suggests that the field-induced reduction of the martensite-to-austenite transition temperature is responsible for the observed sign switching of the magnetocaloric effect.
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American Institute of Physics
Pasquale, M.; Sasso, C. P.; Giudici, L.; Lograsso, Thomas A.; and Schlagel, Deborah L., "Field-driven structural phase transition and sign-switching magnetocaloric effect in Ni–Mn–Sn" (2007). Ames Laboratory Publications. 123.