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arXiv · 1909.08340

Large negative magnetoresistance in the new antiferromagnetic rare-earth dichalcogenide EuTe$_2$

Junjie Yin·Changwei Wu·Lisi Li·Jia Yu·Hualei Sun·Bing Shen·Benjamin A. Frandsen·Dao-Xin Yao·Meng Wang
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Abstract

We report the synthesis and characterization of a rare-earth dichalcogenide EuTe$_2$. An antiferromagnetic transition was found at T$_M$ = 11 K. The antiferromagnetic order can be tuned by an applied magnetic field to access a first-order spin flop transition and a spin flip transition. These transitions are associated with a giant negative magnetoresistance with a value of nearly 100\%. Heat capacity measurements reveal strong electronic correlations and a reduced magnetic entropy. Furthermore, density functional theory calculations demonstrate that the electrons near the Fermi surface mainly originate from the Te 5$p$ orbitals and the magnetism is dominated by localized electrons from the Eu 4$f$ orbitals. These results suggest that both the RKKY and Kondo interactions between the local moments and itinerant electrons play crucial roles in the magnetism and large negative magnetoresistance of EuTe$_2$.

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Junjie Yin, Changwei Wu, Lisi Li, Jia Yu, Hualei Sun, Bing Shen, Benjamin A. Frandsen, Dao-Xin Yao, Meng Wang. 2019-09-18. Large negative magnetoresistance in the new antiferromagnetic rare-earth dichalcogenide EuTe$_2$. https://doi.org/10.1103/physrevmaterials.4.013405

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