Giant magnetic coercivity in orthorhombic YNi4Si-type SmNi4Si compound

Giant magnetic coercivity in orthorhombic YNi4Si-type SmNi4Si compound
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正交晶系YNi4Si型SmNi4Si化合物的巨磁矫顽力

DOI:
10.1016/j.jssc.2015.07.012
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发表时间:
2015-10
影响因子:
3.3
通讯作者:
A. V. Morozkin
A. V. Morozkin
中科院分区:
化学3区
文献类型:
--
作者:
Jinlei Yao;A. V. Morozkin

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研究了YNi_4Si型SmNi_4Si化合物的磁性能、磁热效应和热容量。SmNi 4Si在17 K时发生铁磁转变。在~9 K温度以下,SmNi 4Si的磁性等温线表现出类变磁性,在5 K时的临界磁场为20 kOe。热容测量结果表明,SmNi 4Si的电子热容系数γ=94 mJ/(molK 2),声子系数β= 0.35mJ/(molK 4),德拜温度TD =310 K。利用等温磁化强度(ΔSmmagn)和热容(ΔSmheat)测量得到的等温磁熵变计算了SmNi 4Si的磁热效应。在17 K时,场变为50 kOe时,Δ Smmagnge和Δ Smheat均达到最大值,为-1.0 J/kg K;在~9 K时,场变为20 kOe时,Δ Smmagnge和Δ Smheat均为正值。低于15 K,SmNi 4Si显示出大的磁滞与相当大的剩磁。在5 K温度下,在90 kOe的外加磁场下,其矫顽场高达58 kOe.
Magnetic properties, magnetocaloric effect and heat capacity of the YNi4Si-type SmNi4Si compound have been investigated. SmNi4Si exhibits ferromagnetic transition at 17 K. Below ~9 K, the magnetic isotherms of SmNi4Si show metamagnetic-like behavior with critical field of 20 kOe at 5 K. Heat capacity measurements of SmNi4Si show the electronic heat capacity coefficientγ=94 mJ/(mol K2), phonon coefficientβ=0.35 mJ/(mol K4) and Debye temperatureTD=310 K. The magnetocaloric effect of SmNi4Si is calculated in terms of isothermal magnetic entropy change which is obtained by the isothermal magnetization (ΔSmmagn) and heat capacity measurements (ΔSmheat). Both ΔSmmagnand ΔSmheatreach a maximum of –1.0 J/kg K at 17 K for a field change of 50 kOe and they show positive values for a field change of 20 kOe at ~9 K. Below 15 K, SmNi4Si shows large magnetic hysteresis with considerable remanence. At 5 K it exhibits giant coercive field of 58 kOe in an applied field of 90 kOe.
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