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The weak antilocalization (WAL) effect is known as a quantum correction tothe classical conductivity, which never appeared in two-dimensional magnets. Inthis work, we reported the observation of a WAL effect in the van der Waalsferromagnet Fe5-xGeTe2 with a Curie temperature Tc ~ 270 K, which can evenreach as high as ~ 120 K. The WAL effect could be well described by theHikami-Larkin-Nagaoka and Maekawa-Fukuyama theories in the presence of strongspin-orbit coupling (SOC). Moreover, A crossover from a peak to dip behavioraround 60 K in both the magnetoresistance and magnetoconductance was observed,which could be ascribed to a rare example of temperature driven Lifshitztransition as indicated by the angle-resolved photoemission spectroscopymeasurements and first principles calculations. The reflective magneticcircular dichroism measurements indicate a possible spin reorientation thatkills the WAL effect above 120 K. Our findings present a rare example of WALeffect in two-dimensional ferromagnet and also a magnetotransport fingerprintof the strong SOC in Fe5-xGeTe2. The results would be instructive forunderstanding the interaction Hamiltonian for such high Tc itinerantferromagnetism as well as be helpful for the design of next-generation roomtemperature spintronic or twistronic devices.

Weak Antilocalization Effect up to ~ 120 K in the van der Waals Crystal Fe5-xGeTe2 with Near Room Temperature Ferromagnetism