arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.00865cond-mat.mtrl-sci
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Mn位掺杂反铁磁Mn $_5$ Si $_3$合金的多功能行为

Multifunctional behavior of Mn-site doped antiferromagnetic Mn$_5$Si$_3$ alloys

S. C. Das, S. Pramanick, S. Chatterjee

摘要:

本工作报告了对Ni和Cr掺杂的Mn $_5$ Si $_3$合金的磁电阻和磁热行为的详细研究,该合金具有通式Mn $_{5-x}$ A $_x$ Si $_3$(其中A = Ni/Cr; $x$ = 0、0.05、0.1和0.2)。纯的(未掺杂的)和掺杂的合金都显示出相当大的磁阻(MR)。在Mn位掺杂,无论是由Ni和Cr,在MR值的单调下降的结果。磁热效应(MCE),另一方面,被发现是有趣的,和所有的合金显示常规和逆MCE磁结构转变温度附近。在这两种类型的MCE观察到的,逆MCE被发现随着掺杂浓度的增加而减少,并与MR行为一致,而掺杂的结果在传统的MCE值显着增加。

英文摘要:

Present work reports a detailed investigation on the magnetoresistance and magnetocaloric behavior of Ni and Cr-doped Mn$_5$Si$_3$ alloys with general formula Mn$_{5-x}$A$_x$Si$_3$ (where A = Ni/Cr; $x$ = 0, 0.05, 0.1 and 0.2). Both pure (undoped) and doped alloys show a reasonably large amount of magnetoresistance (MR). Doping at Mn-site, both by Ni and Cr, results in a monotonic decrease in MR values. Magnetocaloric effect (MCE), on the other hand, is found to be interesting, and all the alloys show both conventional and inverse MCE around the magneto-structural transition temperature. Among the two types of MCE observed, the inverse MCE is found to decrease with increasing doping concentration and consistent with the MR behavior, whereas doping results in a significant increase in conventional MCE values.

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