Magnetization and magneto-transport studies on Fe2VAl1-xSix

JOURNAL OF ALLOYS AND COMPOUNDS

卷:648

Article

Amaladass, E. P.¹  Satya, A. T.¹  Sharma, Shilpam¹  Vinod, K.¹  Srinivas, V.²  Sundar, C. S.¹  Bharathi, A.¹ 

[1] Indira Gandhi Ctr Atom Res, Mat Sci Grp, Condensed Matter Phys Div, Kalpakkam 603102, Tamil Nadu, India

[2] Indian Inst Technol, Dept Phys, Madras 600036, Tamil Nadu, India

关键词: Heusler alloy;    Metal insulator transition;    Magnetization;    Super paramagnetic clusters;    Magnetoresistance;   

DOI  :  10.1016/j.jallcom.2015.06.229

来源: Elsevier

【 摘 要 】

We report on magnetoresistance, Hall and magnetization measurements of Fe2VAl1-xSix Heusler compounds for x = 0.005, 0.015, 0.02. There is a systematic change in the temperature coefficient of resistance (TCR) from negative to positive as the Si composition is increased. The Hall co-efficient shows that the carriers are electron like and the carrier density increases with Si concentration. Resistance measurements under magnetic field indicate a decreasing behavior under the application of magnetic field at low temperature region (T < 60 K), suggesting the suppression of scattering by magnetic field. Temperature and field dependent magnetization measurements did not show any significant change apart from the fact that the presence of super paramagnetic (SPM) cluster and its ordering at low temperatures. Arrott plot analysis of magnetization versus field also indicates the magnetic ordering with applied field below 60 K. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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