Unusual field-driven anisotropy of the low-lying ferromagnetic state in NdOs4As12

27th International Conference on Low Temperature Physics

Rudenko, Andrii^1 ; Henkie, Zygmunt^1 ; Cichorek, Tomasz^1

Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wroclaw, Poland^1

关键词: External fields;    Ferromagnetic state;    Ferromagnetic transitions;    Filled skutterudite compounds;    Ground state properties;    Low-temperature specific heat;    Molecular fields;    Point symmetry;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/4/042002/pdf
DOI  :  10.1088/1742-6596/568/4/042002

来源: IOP

【 摘 要 】

We present the low-temperature specific heat C(T) of the filled skutterudite compound NdOs4As12, which undergoes a ferromagnetic transition at Tc1.10K. In the absence of an external field B, the C(T) results show a Schottky-like anomaly at 0.93 K whose origin is attributed to a lowering of the Thcubic point symmetry of the Nd3+ions rather than to an impact of the molecular field. More intriguingly, however, for B 0.25 T applied parallel to the [111] direction, a sharp peak in C(T) occurs at T∗≈ 0.7K. This is in striking contrast to B || [100] where the Curie temperature is essentially unchanged. While more experimental input is needed to resolve the nature of a T∗phase, our observations point at anomalous field- driven ground-state properties of ferromagnetic NdOs4As12.