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Magnetochemistry 2017, 3(1), 3; doi:10.3390/magnetochemistry3010003

Large Inverse Magnetocaloric Effects and Giant Magnetoresistance in Ni-Mn-Cr-Sn Heusler Alloys

1
Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA
2
Department of Physics & Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Adriana Greco
Received: 5 December 2016 / Revised: 22 December 2016 / Accepted: 28 December 2016 / Published: 5 January 2017
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Abstract

The magnetostructural transitions, magnetocaloric effects, and magnetoresistance properties of Ni45Mn43CrSn11 Heusler alloys were investigated using X-ray diffraction (XRD), field-dependent magnetization, and electrical resistivity measurements. A large inverse and direct magnetocaloric effect has been observed in Ni45Mn43CrSn11 across the martensitic and Curie transition temperature, respectively. The values of the latent heat (L = 15.5 J/g) and corresponding magnetic (ΔSM) and total (∆ST) entropy changes (ΔSM = 35 J/kg·K for ΔH = 5T and ∆ST = 39.7 J/kg·K) have been evaluated using magnetic and differential scanning calorimetry (DSC) measurements, respectively. A substantial jump in resistivity was observed across the martensitic transformation. A large negative magnetoresistance (~67%) was obtained at the magnetostructural transition for a field change of 5 T. The roles of the magnetic and structural changes on the transition temperatures and the potential application of Ni45Mn43CrSn11 Heusler alloys for refrigerator technology are discussed. View Full-Text
Keywords: magnetocaloric effects; magnetoresistance; Heusler alloys magnetocaloric effects; magnetoresistance; Heusler alloys
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MDPI and ACS Style

Pandey, S.; Quetz, A.; Aryal, A.; Dubenko, I.; Mazumdar, D.; Stadler, S.; Ali, N. Large Inverse Magnetocaloric Effects and Giant Magnetoresistance in Ni-Mn-Cr-Sn Heusler Alloys. Magnetochemistry 2017, 3, 3.

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