Durgesh Singh, Akhilesh Kumar Patel, Barnabha Bandyopadhyay, R. Venkatesh, Satyam Kumar, K. G. Suresh
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引用次数: 0
Abstract
We have investigated the influence of Ni and Co doping for Mn in Ni50Mn20(Ni/Co)5Ga25 by means of XRD, optical microscopy, resistivity and magnetization measurements. Both the alloys are martensitic at room temperature. Temperature-dependent XRD data shows that the martensitic transition in the Ni and Co doped sample occurs close to 700 K and 900 K respectively. Hysteresis seen in the resistivity and magnetization studies on both the samples in the martensitic regime is attributed to the dynamics associated with the ferromagnetic clusters developed just below TC. By comparing the results on the two alloys, we show that the differences in their structural, magnetic and electrical properties can be mainly attributed to the difference in the electronic band structure brought about by these two (Ni vs. Co) substituents.
采用XRD、光学显微镜、电阻率和磁化率等方法研究了Ni和Co掺杂对Ni50Mn20(Ni/Co)5Ga25中Mn的影响。两种合金在室温下均为马氏体。温度相关的XRD数据表明，Ni和Co掺杂样品的马氏体转变分别发生在700 K和900 K附近。在马氏体状态下两种样品的电阻率和磁化研究中看到的滞后归因于与TC以下发展的铁磁团簇相关的动力学。通过对比两种合金的结果，我们发现它们的结构、磁性和电学性能的差异主要归因于这两种取代基（Ni vs Co）所带来的电子能带结构的差异。
期刊介绍：
Indian Journal of Physics is a monthly research journal in English published by the Indian Association for the Cultivation of Sciences in collaboration with the Indian Physical Society. The journal publishes refereed papers covering current research in Physics in the following category: Astrophysics, Atmospheric and Space physics; Atomic & Molecular Physics; Biophysics; Condensed Matter & Materials Physics; General & Interdisciplinary Physics; Nonlinear dynamics & Complex Systems; Nuclear Physics; Optics and Spectroscopy; Particle Physics; Plasma Physics; Relativity & Cosmology; Statistical Physics.
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