Peculiar magnetocaloric properties and critical behavior in antiferromagnetic Tb3Ni with complex magnetic structure
作者:A. Herrero、A. Oleaga、A.F. Gubkin、A. Salazar、N.V. Baranov
DOI:10.1016/j.jallcom.2019.151720
日期:2019.11
a conventional (direct) magnetocaloric effect with a maximum at 65 K and very competitive properties: | Δ S M p k | = 16.6 J/kgK, RCFWHM = 432 J/kg, with a 50 K span, for μ0ΔH = 5 T, which is due to the transition from a magnetically ordered state to the paramagnetic (PM) state with a combined antiferromagnetic to ferromagnetic (AFM-FM) metamagnetic transition. Besides, it also presents an inverse magnetocaloric
摘要 对 Tb3Ni 单晶(在正交 Pnma 空间群中结晶)的磁热特性进行了研究,并结合对其磁跃迁的特征和临界行为的研究。由于其温度和磁场引起的相变的丰富性和多样性,它在 3-90 K 的温度范围内呈现出两个重要的磁热效应。有一种传统的(直接)磁热效应,最大值为 65 K,并且具有非常有竞争力的特性: | Δ SM pk | = 16.6 J/kgK,RCFWHM = 432 J/kg,跨度为 50 K,对于 μ0ΔH = 5 T,这是由于从磁性有序状态到顺磁性 (PM) 状态的转变以及反铁磁性到铁磁性的组合( AFM-FM) 变磁跃迁。除了,它还在极低温度下呈现出反磁热效应,这是 AFM 和 FM 状态之间存在变磁转变的原因(Δ SM pk =19.9 J/kgK,RCFWHM = 245 J/kg,跨度为 15 K,对于 μ0ΔH = 5 吨)。在低场 (