Comparing magnetostructural transitions in Ni50Mn18.75CU6.25Ga25 and Ni49.80Mn34.66In15.54 Heusler alloys

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:401

Article

Dubenko, Igor¹  Granovsky, Alexander²  Lahderanta, Erkki³  Kashirin, Maxim⁴  Makagonov, Vladimir⁴  Aryal, Anil¹  Quetz, Abdiel¹  Pandey, Sudip¹  Rodionov, Igor²  Samanta, Tapas⁵  Stadler, Shane⁵  Mazumdar, Dipanjan¹  Ali, Naushad¹ 

[1] So Illinois Univ, Dept Phys, Carbondale, IL 62901 USA

[2] Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia

[3] Lappeenranta Univ Technol, Lappeenranta 53851, Finland

[4] Voronezh State Tech Univ, Voronezh 394026, Russia

[5] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

关键词: Heusler alloys;    Magneto-structural transitions;    Thermoelectricity;    Multifunctional;   

DOI  :  10.1016/j.jmmm.2015.11.025

来源: Elsevier

【 摘 要 】

The crystal structure, magnetic and transport properties, including resistivity and thermopower, of NisoMnis 75Cu6.25Ga25 and Ni49.80Mn34.66In15.54 Heusler alloys were studied in the (10-400) K temperature interval. We show that their physical properties are remarkably different, thereby pointing to different origin of their magnetostructural transition (MST). A Seebeck coefficient (S) was found to pass minimum of about -20 mu V/K in respect of temperature for both compounds. It was shown that MST observed for both compounds results in jump-like changes in S for Ga-based compound and jump in resistivity of about 20 and 200 mu Omega cm for Ga and In -based compounds, respectively. The combined analyzes of the present results with that from literature show that the density of states at the Fermi level does not change strongly at the MST in the case of Ni-Mn-In alloys as compared to that of Ni-Mn-Ga. (C) 2015 Elsevier B.V. All rights reserved.

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