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Article
Field-driven structural phase transition and sign-switching magnetocaloric effect in Ni–Mn–Sn
Applied Physics Letters
Document Type
Article
Disciplines
Publication Date
9-26-2007
DOI
10.1063/1.2790829
Abstract
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.
Rights
Copyright 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Copyright Owner
American Institute of Physics
Copyright Date
2007
Language
en
File Format
application/pdf
Citation Information
M. 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/
The following article appeared in Applied Physics Letters 91 (2007): 131904 and may be found at http://dx.doi.org/10.1063/1.2790829.