Research interests in recent years have expanded into quantum materials that display novel magnetism incor-porating strong correlations,topological effects,and dimensional crossovers.Fe3GeTe2 represents such a two-dimensional van der Waals platform exhibiting itinerant ferromagnetism with many intriguing properties.Up to date,most electronic transport studies on Fe3GeTe2 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 Fe3GeTe2.Upon cooling to the base temperature,the sample develops a resistivity upturn that shows a crossover from a marginally-lnT to a-T1/2 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 magnetore-sistance at low temperatures with a scaling function proportional-HT1/2,as well as a temperature-independent linear term.Possible mechanisms that could account for our observations are discussed.

Honglei Feng;Yong Li;Youguo Shi;Hong-Yi Xie;Yongqing Li;Yang Xu

Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;Songshan Lake Materials Laboratory,Dongguan 523808,China;Division of Quantum State of Matter,Beijing Academy of Quantum Information Sciences,Beijing 100193,China

中国物理快报（英文版）

[1]Honglei Feng;Yong Li;Youguo Shi;Hong-Yi Xie;Yongqing Li;Yang Xu-.Resistance Anomaly and Linear Magnetoresistance in Thin Flakes of Itinerant Ferromagnet Fe3GeTe2)[J].中国物理快报（英文版）,2022(07):130-136

Flakes,Itinerant,Ferromagnet,Fe3GeTe2,crossovers,upturn,lnT,magnetore

Resistance,Anomaly,Linear,Magnetoresistance,Thin,Research,interests,recent,years,have,expanded,into,quantum,materials,that,display,novel,incor,porating,strong,correlations,topological,effects,dimensional,represents,such,two,van,der,Waals,platform,exhibiting,itinerant,ferromagnetism,many,intriguing,properties,date,most,electronic,transport,studies,been,limited,its,anomalous,Hall,responses,while,longitudinal,counterpart,magnetoresistance,remains,largely,unexplored,Here,report,few,unusual,behaviors,thin,flakes,Upon,cooling,base,sample,develops,resistivity,shows,from,marginally,dependence,followed,by,lower,deviation,Moreover,observe,negative,saturating,linear,when,magnetization,antiparallel,external,magnetic,field,slope,also,nonmonotonic,We,deduce,contribution,temperatures,scaling,function,proportional,HT1,well,independent,term,Possible,mechanisms,could,account,our,observations,are,discussed

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