发表机构
New Cornerstone Science Laboratory, Center for Correlated Matter and School of Physics, Zhejiang University; Hubei Key Laboratory of Photoelectric Materials and Devices, School of Materials Science and Engineering, Hubei Normal University（浙江大学关联物质中心与物理学院新基石科学实验室; 湖北师范大学材料科学与工程学院光电材料与器件湖北省重点实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究报道单晶Ce$_4$Ge$_7$在磁场和压力下的磁性演化，发现其反铁磁转变及变磁转变，并在临界压力附近观察到非费米液体行为，暗示存在反铁磁量子临界点。
AI 中文摘要
我们报道了单晶Ce$_4$Ge$_7$的磁性和输运性质，该化合物结晶于非中心对称的正交结构（空间群C222$_1$）。它在$T_N$ = 7.3 K处经历反铁磁转变。当磁场沿$b$轴施加时，在1.3 T（2 K时）发生变磁转变。相应地，该转变产生异常霍尔效应，该效应由本征Karplus-Luttinger机制主导。在静水压力下，Ce$_4$Ge$_7$的$T_N$最初略有增加，随后逐渐被抑制。对于高于$P_c$ = 10.2 GPa的压力，未观察到磁有序。$A$系数的发散、残余电阻率的最大值以及$P_c$附近的非费米液体行为表明Ce$_4$Ge$_7$中可能存在反铁磁量子临界点。
英文摘要
We report the magnetic and transport properties of single-crystalline Ce$_4$Ge$_7$, which crystallizes in a non-centrosymmetric orthorhombic structure (space group C222$_1$). It undergoes an antiferromagnetic transition at $T_N$ = 7.3 K. When a magnetic field is applied along the $b$-axis, a metamagnetic transition occurs at 1.3 T (at 2 K). Correspondingly, this transition gives rise to an anomalous Hall effect, which is dominated by the intrinsic Karplus-Luttinger mechanism. Under hydrostatic pressure, $T_N$ of Ce$_4$Ge$_7$ initially increases slightly and is then gradually suppressed. For pressures above $P_c$ = 10.2 GPa, no magnetic order is observed. The divergence of the $A$ coefficient, the maximum of the residual resistivity, and the non-Fermi liquid behavior around $P_c$ indicate the possible existence of an antiferromagnetic quantum critical point in Ce$_4$Ge$_7$.
