Field-driven structural phase transition and sign-switching magnetocaloric effect in Ni-Mn-Sn
| Title | Field-driven structural phase transition and sign-switching magnetocaloric effect in Ni-Mn-Sn |
| Publication Type | Journal Article |
| Year of Publication | 2007 |
| Authors | Pasquale M, Sasso CP, Giudici L, Lograsso T, Schlagel D |
| Journal Title | Applied Physics Letters |
| Volume | 91 |
| Pages | 131904 |
| Date Published | Sep |
| Type of Article | Article |
| ISBN Number | 0003-6951 |
| Accession Number | ISI:000249787000027 |
| 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. |
| DOI | 10.1063/1.2790829 |
| Alternate Journal | Appl. Phys. Lett. |
