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arXiv 1107.2580cond-mat.str-el
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反铁磁Yb $_{3}$ Pt $_{4}$的磁场调谐

Magnetic field tuning of antiferromagnetic Yb$_{3}$Pt$_{4}$

L. S. Wu, Y. Janssen, C. Marques, M. C. Bennett, M. S. Kim, K. Park, Songxue Chi, J. W. Lynn, G. Lorusso, G. Biasiol, M. C. Aronson

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9 pages, 6 figures
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摘要：

我们目前的比热，磁化强度，磁热效应和磁中子衍射的测量进行反铁磁Yb $_{3}$ Pt $_{4}$，其中高度本地化的Yb矩在$T_{\rm N}=2.4$ K在零场秩序的单晶。通过在$ab$平面中施加1.85 T的场，反铁磁序被抑制为$T_{\rm N}\rightarrow 0$。磁热效应的测量表明，反铁磁相变总是连续的$T_{\rm N}>0$，虽然一个明显的步骤中的磁化观察到的临界场在中子衍射和磁化测量。这些步骤随着温度的降低而变尖锐，但磁化率的相关发散在最低温度下被切断，其中相线本身在场-温度平面中变得垂直。作为$T_{\rm N}\rightarrow0$，反铁磁转变越来越受到量子临界端点的影响，其中$T_{\rm N}$最终在一级相变中消失。

英文摘要：

We present measurements of the specific heat, magnetization, magnetocaloric effect and magnetic neutron diffraction carried out on single crystals of antiferromagnetic Yb$_{3}$Pt$_{4}$, where highly localized Yb moments order at $T_{\rm N}=2.4$ K in zero field. The antiferromagnetic order was suppressed to $T_{\rm N}\rightarrow 0$ by applying a field of 1.85 T in the $ab$ plane. Magnetocaloric effect measurements show that the antiferromagnetic phase transition is always continuous for $T_{\rm N}>0$, although a pronounced step in the magnetization is observed at the critical field in both neutron diffraction and magnetization measurements. These steps sharpen with decreasing temperature, but the related divergences in the magnetic susceptibility are cut off at the lowest temperatures, where the phase line itself becomes vertical in the field-temperature plane. As $T_{\rm N}\rightarrow0$, the antiferromagnetic transition is increasingly influenced by a quantum critical endpoint, where $T_{\rm N}$ ultimately vanishes in a first order phase transition.

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