Field-driven structural phase transition and sign-switching magnetocaloric effect in Ni–Mn–SnApplied Physics Letters
AbstractDepending 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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Copyright OwnerAmerican Institute of Physics
Citation InformationM. Pasquale, C. P. Sasso, L. Giudici, Thomas A. Lograsso, et al.. "Field-driven structural phase transition and sign-switching magnetocaloric effect in Ni–Mn–Sn" Applied Physics Letters Vol. 91 Iss. 13 (2007) p. 131904
Available at: http://works.bepress.com/thomas_lograsso/96/