Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-12-13
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 5 figures, Accepted for publication in Journal of Applied Physics
Scientific paper
The effect of Si and Ga substitutions on the magnetic and the magnetocaloric properties in Heusler based system Ni46Co4Mn38Sb12-xZx (Z=Si and Ga) has been studied. From the M(T) plots it is found that Si substitution stabilizes the austenite phase, whereas, Ga substitution stabilizes the martensite phase. Strong metamagnetic behaviour is observed in the M(H) isotherms for Si=0.75 and 1, whereas, such a behaviour is absent in the Ga substituted alloys. Associated with magneto-structural transition, large MCE of 58 J/kg K and 70 J/kg K is observed for x=0.75 and 1, respectively in the case of Si. Though the MCE observed in x=0.5 and 1 in the case of Ga is much lower, the MCE peak is found to be quite broad.
Nayak Ajaya K.
Nigam A. K.
Sahoo Roshnee
Suresh K. G.
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