Chin. Phys. Lett.  2022, Vol. 39 Issue (7): 077501    DOI: 10.1088/0256-307X/39/7/077501
Resistance Anomaly and Linear Magnetoresistance in Thin Flakes of Itinerant Ferromagnet Fe$_{3}$GeTe$_{2}$
Honglei Feng1,2, Yong Li1,2, Youguo Shi1,2,3, Hong-Yi Xie4, Yongqing Li1,2,3, and Yang Xu1,2*
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
3Songshan Lake Materials Laboratory, Dongguan 523808, China
4Division of Quantum State of Matter, Beijing Academy of Quantum Information Sciences, Beijing 100193, China
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Honglei Feng, Yong Li, Youguo Shi et al  2022 Chin. Phys. Lett. 39 077501
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Abstract Research interests in recent years have expanded into quantum materials that display novel magnetism incorporating strong correlations, topological effects, and dimensional crossovers. Fe$_{3}$GeTe$_{2}$ represents such a two-dimensional van der Waals platform exhibiting itinerant ferromagnetism with many intriguing properties. Up to date, most electronic transport studies on Fe$_{3}$GeTe$_{2}$ have been limited to its anomalous Hall responses while the longitudinal counterpart (such as magnetoresistance) remains largely unexplored. Here, we report a few unusual transport behaviors on thin flakes of Fe$_{3}$GeTe$_{2}$. Upon cooling to the base temperature, the sample develops a resistivity upturn that shows a crossover from a marginally $-\ln T$ to a ${-}{T}^{1/2}$ dependence, followed by a lower-temperature deviation. Moreover, we observe a negative and non-saturating linear magnetoresistance when the magnetization is parallel or antiparallel to the external magnetic field. The slope of the linear magnetoresistance also shows a nonmonotonic temperature dependence. We deduce an anomalous contribution to the magnetoresistance at low temperatures with a scaling function proportional ${-HT}^{1/2}$, as well as a temperature-independent linear term. Possible mechanisms that could account for our observations are discussed.
Received: 29 March 2022      Express Letter Published: 01 June 2022
PACS:  75.47.-m (Magnetotransport phenomena; materials for magnetotransport)  
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Honglei Feng
Yong Li
Youguo Shi
Hong-Yi Xie
Yongqing Li
and Yang Xu
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