四元金属间硼碳化物RCo2B2C（R=Dy，Ho，Er）的磁结构

金属间硼碳化物TbCo2B2C的铁磁结构

On the ferromagnetic structure of the intermetallic borocarbide TbCo2B2C

基于磁化，比热，磁致伸缩，和中子衍射研究的单晶TbCo 2B 2C，它被发现的顺磁性，液氮温度下，很好地描述了居里-外斯行为的Tb+3时刻。此外，低于Tc= 6.3 K，Tb亚晶格经历铁磁（FM）相变，易磁化轴沿着（100）方向，并且伴随着，晶胞经历四方到正交畸变。对于高达90 kOe的磁场，没有观察到Co 3d轨道的场致分裂;因此，内部磁场必须远低于使Co 3d子系统稳定所需的临界值。FM状态的表现在TbCo 2B 2C是唯一的所有其他同晶硼碳化物，特别是TbNi 2B 2C（Tn=15 K，无公度调制的磁状态），即使在两个同晶型的Tb-离子具有几乎相同的晶体电场属性。这些Tb基同构的磁模式的差异是由于它们的晶格参数和费米能级的位置的变化引起的交换耦合的差异。

四硼碳化物：超导体DFT的测试平台

Quaternary borocarbides: a testbed for DFT for superconductors

本文通过四硼碳化物研究，探讨了SCDFT在计算超导临界温度$T_c$时的挑战与机制，揭示了电子-声子耦合和动态相互作用的影响。

镧系和锕系金属间化合物的非常规超导电性和磁性

Unconventional Superconductivity and Magnetism in Lanthanide and Actinide Intermetallic Compounds

在这篇评论文章中，我们提出了一个调查的非常规超导体和它们的共存行为与磁性。重点讨论了铈基和铀基重费米子超导体，此外还讨论了稀土硼碳化物和方钴矿超导体。我们表明，重费米子行为的Ce-和U-化合物应不同的描述。虽然近藤晶格模型与本地化的4f-电子是适当的Ce-化合物，双模型，包括本地化和巡回5 f-电子是必要的U-化合物。我们证明，这导致一致的费米表面拓扑结构和质量增强的各种U-化合物的结果。我们还表明，虚拟交换局域5 f电子激发提供了一个新的机制，非常规超导除了已知的巡回自旋涨落交换机制。我们讨论的对称性和共存的非常规超导和密度波（隐藏）序参量和方法，他们的检测，特别是新的角度分辨magnetototosport方法。后者对于消除硼碳超导体中的带隙各向异性是非常成功的。本文还评述了近年来有关Pr-方钴矿多相超导体的研究成果。

Review of magnetic properties and magnetocaloric effect in the intermetallic compounds of rare earth with low boiling point metal(s)

The magnetocaloric effect (MCE) in many rare earth (RE) based intermetallic compounds has been extensively investigated during last two decades, not only due to their potential applications for magnetic refrigeration but also for better understanding of the fundamental problems of the materials. This paper reviews our recent progress of magnetic properties and MCE in some binary or ternary intermetallic compounds of RE with low boiling point metal(s) (Zn, Mg, and Cd). Some of them are exhibiting promising MCE properties which make them also attractive for low temperature magnetic refrigeration…

Observation of Griffiths-like phase in the quaternary Heusler compound NiFeTiSn

The quaternary Heusler compound NiFeTiSn can be considered to be derived from the exotic pseudogap-compound Fe2TiSn by the replacement of one Fe atom by Ni. In contrast to Fe2TiSn, which shows a disorder-induced ferromagnetic phase, the ground state of NiFeTiSn is antiferromagnetic with the signature of spin canting. Interestingly, NiFeTiSn shows a Griffiths-like phase characterized by isolated ferromagnetic clusters before attaining the antiferromagnetic state. The Griffiths-like phase is possibly associated with the antisite disorder between Fe and Ti sites as evident from our powder X-ray d…

Heavy fermion behavior in PrRh2B2C: Excitonic mass enhancement

We report magnetic and transport properties of a new quaternary borocarbide PrRh$_{2}$B$_{2}$C, based on magnetisation, resistivity and specific heat studies. This compound forms in LuNi$_{2}$B$_{2}$C-type tetragonal structure (space group {\it I4/mmm}) and does not exhibit magnetic ordering or superconductivity down to 0.5 K. The crystal field analysis of specific heat data suggests a singlet ground state in this compound. The high value of the Sommerfeld coefficient, $γ$ $\approx$ 250 mJ/mole K$^{2}$, together with a singlet ground state suggests that the heavy fermion behaviour in PrRh$_{2}…