Phase Transitions, Magnetotransport and Magnetocaloric Effects in a New Family of Quaternary Ni–Mn–In–Z Heusler Alloys
Abstract:The magnetic, magnetotransport, and magnetocaloric properties near compound phase transitions in Ni50Mn35In14Z (Z=In, Ge, Al), and Ni48Co2Mn35In15 Heusler alloys have been studied using VSM and SQUID magnetometers (at magnetic fields (H) up to 5 T), four-probe method (at H = 0.005–1.5 T), and an adiabatic magnetocalorimeter (for H changes up to ΔH = 1.8 T), respectively. The martensitic transformation (MT) is accompanied by large magnetoresistance (up to 70%), a significant change in resistivity (up to 200%), and a sign reversal of the ordinary Hall effect coefficient, all related to a strong change in the electronic spectrum at the MT. The field dependences of the Hall resistance are complex in the vicinity of the MT, indicating a change in the relative concentrations of the austenite and martensite phases at strong fields. Negative and positive changes in adiabatic temperatures of about −2 K and +2 K have been observed in the vicinity of MT and Curie temperatures, respectively, for ΔH = 1.8 T.
Document Type: Research Article
Publication date: September 1, 2012
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