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Large Negative Thermal Expansion and Magnetoelastic Coupling in Metamagnetic Tetragonal (Mn, T ) 2 Sb ( T  = Cr, V) Alloys
Journal of Superconductivity and Novel Magnetism ( IF 1.8 ) Pub Date : 2020-05-29 , DOI: 10.1007/s10948-020-05520-3
Yuzhuo Yan , Jiancheng Yang , Ni Zhao , Guiquan Yao , Xiaoxiao Fu , Yongjian Zhang , Weibin Cui

Metamagnetic phase transition of Mn2-xCrxSb (x = 0.07, 0.09, and 0.11) and Mn2-yVySb (y = 0.1, 0.15) alloys had been studied. More Cr and V substitutions lead into increased phase transition temperature, which is confirmed by differential scanning calorimetry (DSC) measurement. The maximized saturation magnetostriction (λs//) of − 1350 ppm and − 610 ppm under 7 T have been realized in Mn1.93Cr0.07Sb alloy and Mn1.9V0.1Sb alloy, respectively, and gradually decreased with more substitution. Giant negative thermal expansion (NTE) is triggered by metamagnetism. The highest linear coefficient of − 42.4 ppm/K is obtained in Mn1.93Cr0.07Sb alloy, but almost zero expansion is obtained in Mn1.85V0.15Sb alloy. The coincident highest ΔSmax associated with the maximized λs// in both Mn2-xCrxSb (x = 0.07, 0.09, and 0.11) and Mn2-yVySb (y = 0.1, 0.15) systems suggests that the strong magnetoelastic coupling is also beneficial to enhance the magnetic entropy change.

中文翻译:

亚磁四方(Mn,T)2 Sb(T = Cr,V)合金中的大负热膨胀和磁弹性耦合

研究了Mn 2- x Cr x Sb(x  = 0.07、0.09和0.11)和Mn 2- y V y Sb(y  = 0.1,0.15)合金的亚磁相变。更多的Cr和V取代导致相变温度升高,这已通过差示扫描量热法(DSC)测量得到证实。最大化饱和磁致伸缩(λ小号//)的- 1350 ppm的和- 610 ppm的下7吨有锰已经实现1.930.07 Sb合金和Mn 1.9 V 0.1锑合金分别逐渐取代,并逐渐减少。巨大的负热膨胀(NTE)由超磁性触发。在Mn 1.93 Cr 0.07 Sb合金中可获得最高线性系数− 42.4 ppm / K ,而在Mn 1.85 V 0.15 Sb合金中可获得几乎零膨胀。重合最高ΔS最大值与最大化λ相关小号//在两个锰2- X的Cr X锑(X  = 0.07,0.09,和0.11)和Mn 2- ÿ V Ý的Sb(ÿ = 0.1,0.15)系统表明强磁弹性耦合也有利于增强磁熵变。
更新日期:2020-05-29
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