磁场调控CeNiGe $_{3}$的低温物理性能
Tuning Low Temperature Physical Properties of CeNiGe$_{3}$ by Magnetic Field
摘要：
我们已经研究了热，磁，和电性能的三元金属间化合物系统CeNiGe $_{3}$通过比热，磁化强度和电阻率测量。在晶体电场点电荷模型的基础上，对比热数据和各向异性磁化率进行了分析。Ce $^{3+}$的$J$ 1 = 1，5/2多重峰被晶体电场（CEF）分裂成三个Kramers双重峰，其中第二和第三双重峰分别被$Δ_{1}$ $\sim$ 100 1，K和$Δ_{2}$ $\sim$ 170 1，K与第一（基态）双重峰分开。在零场CeNiGe中，$_{3}$在$T_{N}$ = 5.01，K以下呈现反铁锰有序.对于\textbf{H} \，$\parallel$ \，\textbf{a}，在2，$\sim$\，4\，K之间有明显的变磁转变，从磁化等温线可以看出，变磁转变的范围可以扩展到0. 4\，K.对于\textbf{H}、$\parallel$、\textbf{a}，随着磁场的增加，$T_{N}$向较低温度移动，并最终在$H_{c}$ $\sim$ 32.5kOe处消失。对于$H\,>\,H_{c}$，电阻率显示二次温度依赖性（$Δρ= A T^{2}$）。对于$H \gg H_{c}$，出现了$Δρ$与$n > 2$的非常规$T^{n}$依赖性，指数$n$随着磁场的增加而变大。虽然CeNiGe $_{3}$中的反铁磁相变温度可以被连续地抑制到零，但它提供了一个与当前量子临界性的简单模型不匹配的场调谐的示例。
英文摘要：
We have studied the thermal, magnetic, and electrical properties of the ternary intermetallic system CeNiGe$_{3}$ by means of specific heat, magnetization, and resistivity measurements. The specific heat data, together with the anisotropic magnetic susceptibility, was analyzed on the basis of the point charge model of crystalline electric field. The $J$\,=\,5/2 multiplet of the Ce$^{3+}$ is split by the crystalline electric field (CEF) into three Kramers doublets, where the second and third doublet are separated from the first (ground state) doublet by $Δ_{1}$ $\sim$ 100\,K and $Δ_{2}$ $\sim$ 170\,K, respectively. In zero field CeNiGe$_{3}$ exhibits an antiferromangeic order below $T_{N}$ = 5.0\,K. For \textbf{H}\,$\parallel$\,\textbf{a} two metamagnetic transitions are clearly evidenced between 2\,$\sim$\,4\,K from the magnetization isotherm and extended down to 0.4\,K from the magnetoresistance measurements. For \textbf{H}\,$\parallel$\,\textbf{a}, $T_{N}$ shifts to lower temperature as magnetic field increases, and ultimately disappears at $H_{c}$ $\sim$ 32.5\,kOe. For $H\,>\,H_{c}$, the electrical resistivity shows the quadratic temperature dependence ($Δρ= A T^{2}$). For $H \gg H_{c}$, an unconventional $T^{n}$-dependence of $Δρ$ with $n > 2$ emerges, the exponent $n$ becomes larger as magnetic field increases. Although the antiferromagnetic phase transition temperature in CeNiGe$_{3}$ can be continuously suppressed to zero, it provides an example of field tuning that does not match current simple models of Quantum criticality.
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