Origin of the Anomalous Electrical Transport Behavior in Fe‐Intercalated Weyl Semimetal T<sub>d</sub>‐MoTe<sub>2</sub>
Tianyang Wang, Xuan Luo, Jingjing Gao, Zhongzhu Jiang, Wei Wang, Xingcai Yang, Nan Zhou, Xiaoguang Zhu, Lei Zhang, W. J. Lu, Wenhai Song, Hongyan Lv, Yuping Sun
Abstract
Abstract Weyl semimetal T d ‐MoTe 2 has recently attracted much attention due to its intriguing electronic properties and potential applications in spintronics. Here, Fe‐intercalated T d ‐Fe x MoTe 2 single crystals (0 < x < 0.15 ) are grown successfully. The electrical and thermoelectric transport results consistently demonstrate that the phase transition temperature T S is gradually suppressed with increasing x . Theoretical calculation suggests that the increased energy of the T d phase, enhanced transition barrier, and more occupied bands in 1T′ phase is responsible for the suppression in T S . In addition, a ρ α –ln T behavior induced by Kondo effect is observed with x ≥ 0.08, due to the coupling between conduction carriers and the local magnetic moments of intercalated Fe atoms. For T d ‐Fe 0.15 MoTe 2 , a spin‐glass transition occurs at ≈10 K. The calculated band structure of T d ‐Fe 0.25 MoTe 2 shows that two flat bands exist near the Fermi level, which are mainly contributed by the d yz and orbitals of the Fe atoms. Finally, the electronic phase diagram of T d ‐Fe x MoTe 2 is established for the first time. This work provides a new route to control the structural instability and explore exotic electronic states for transition‐metal dichalcogenides.