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Magnetic phase transitions in Nd7Rh3 single crystal

机译：Nd7Rh3单晶中的磁性相变

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摘要

Magnetic phase transitions in rare earth intermetallic compound Nd7Rh3 have been investigated using a single crystal. Measurement results of magnetization, magnetic susceptibility, specific heat, and electrical resistivity reveal that Nd7Rh3 has two magnetic phase transitions at TN=34 K, Tt2=9.1 K and a change of the magnetic feature at Tt1=6.8 K in the absence of an external magnetic field. Antiferromagnetic orderings exist in all the three magnetic states; a large magnetic anisotropy between the c-axis and the c-plane is observed. In the magnetic phase below Tt2, an irreversible field-induced magnetic phase transition takes place in the c-plane; after removing external magnetic field, a coexistence state of ferro- and antiferromagnetic ordering or a ferrimagnetic state having a remanent magnetization MR is stabilized. The MR decays to a certain value for several hours after the first process; a magnetic field cooling effect was also observed in the c-plane below Tt2. In the antiferromagentic state above Tt2, the irreversibility disappears and an ordinary antiferromagnetic state takes place. As the origin of this phenomenon, a kind of martensitic structural transition that is observed in Gd5Ge4 can be considered.
机译：已使用单晶研究了稀土金属间化合物Nd7Rh3中的磁性相变。磁化强度，磁化率，比热和电阻率的测量结果表明，Nd7Rh3在TN = 34 K，Tt2 = 9.1 K时有两个磁相变，并且在没有外部磁场的情况下在Tt1 = 6.8 K时磁特性发生了变化。磁场。在所有三种磁性状态下都存在反铁磁顺序。在c轴和c平面之间观察到较大的磁各向异性。在低于Tt2的磁相中，在c平面中发生不可逆的磁场诱导的磁相变。在去除外部磁场之后，铁和反铁磁有序的共存状态或具有剩余磁化强度MR的亚铁磁状态被稳定。在第一个过程后的几个小时内，MR衰减到某个值。在Tt2以下的c平面上也观察到磁场冷却效果。在高于Tt2的反铁磁状态下，不可逆性消失，并发生普通的反铁磁状态。作为该现象的起源，可以考虑在Gd5Ge4中观察到的一种马氏体结构转变。

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