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arXiv · 2609.37129

Evolution of Magnetism in Ce$_4$Ge$_7$ under Magnetic Field and Pressure

Kaixin Ye·Qihe Yu·Yongjian Li·Yanan Zhang·Ye Chen·Rui Li·Lin Jiao·M. Smidman·Yongjun Zhang·Yu Liu·Huiqiu Yuan
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Abstract

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$_7$.

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Kaixin Ye, Qihe Yu, Yongjian Li, Yanan Zhang, Ye Chen, Rui Li, Lin Jiao, M. Smidman, Yongjun Zhang, Yu Liu, Huiqiu Yuan. 2026-09-29. Evolution of Magnetism in Ce$_4$Ge$_7$ under Magnetic Field and Pressure. https://arxiv.org/abs/2609.37129

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