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arXiv 1003.6116cond-mat.str-el
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Ni-Mn-Sn-Ga合金的室温巨磁热效应

Giant magneto-caloric effect near room temperature in Ni-Mn-Sn-Ga alloys

S. Chatterjee, S. Giri, S. Majumdar, S. K. De

摘要:

本文报道了名义成分为Ni、$_2$、Mn、$_{1.36}$、Sn、$_{0.64-x}$、Ga、$_{x}$($x$ =0.24、0.28和0.32)的铁磁形状记忆合金中的巨磁热效应(MCE)的观测结果。无论Ga掺杂与否,所有样品在低于330 K时都经历了长程铁磁有序。然而,马氏体转变温度($T_{MS}$)的样品的强烈变化与Ga浓度。对于所有样品,$T_{MS}$周围的场致跃迁的清晰特征可见。观测到的MCE($ΔS$ = 13.6 J/kg K)在$x$ = 0.28时最高,峰值在249 K附近,而$x$ = 0.32则表明在274 K时$ΔS$ = 12.8 J/kg K。发现这一系列Ga掺杂合金是在不同温度范围内具有高$ΔS$值的有趣材料

英文摘要:

We report the observation of giant magneto-caloric effect (MCE) in ferromagnetic shape memory alloys (FSMAs) of nominal compositions Ni$_2$Mn$_{1.36}$Sn$_{0.64-x}$Ga$_{x}$ ($x$ =0.24, 0.28 and 0.32). Irrespective of the Ga doping, all the samples undergo long range ferromagnetic ordering below around 330 K. However, the martensitic transition temperature ($T_{MS}$) of the samples varies strongly with Ga concentration. Clear signature of field induced transition around $T_{MS}$ is visible for all the samples. The observed MCE ($ΔS$ = 13.6 J/kg K for field changing from 0 to 50 kOe) is found to be highest for $x$ = 0.28 with peak near 249 K, while $x$ = 0.32 shows $ΔS$ = 12.8 J/kg K at 274 K. This series of Ga-doped alloys are found to be interesting materials with high value of $ΔS$ over a varied range of temperature

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