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| Abstract | FZJ-2022-01806 |
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2021
Please use a persistent id in citations: http://hdl.handle.net/2128/30955
Abstract: Topological quantum materials have attracted enormous attention since their discovery due to the observedanomalous transport properties, which originate due to the non-zero Berry curvature. Mn3Ge has gainedspecial attention because of its large anomalous Hall and Nernst effects that persist starting from Néeltemperature (365 K) down to 2 K [1, 2]. Several experimental observations support the claim for Mn3Geas a Weyl semimetal [1 - 3]. However, the chiral anomaly in this sample has not been fully understood yet.We have performed angle, temperature, and magnetic field (B) dependent magnetoresistance (MR) andplanar Hall effect (PHE) measurements with B and electric current (I) applied along the variouscombinations of the crystallographic axes of Mn3Ge. We have observed negative longitudinal MR and PHEoscillations in certain magnetic field and temperature regimes, for various combinations of I, B, andcrystallographic axes. These observations are the signature of chiral anomaly, but they can arise withoutchiral anomaly also. The detailed analysis of the temperature and magnetic field dependent behavior of MRand PHE strongly suggest that the chiral anomaly is most likely present in the Mn3Ge. Also, we haveobserved that the slope of longitudinal MR and Hall resistivity at high field changes its sign in thetemperature range of 165 - 230 K. The lattice thermal expansion coefficient has also shown a change insign near 230 K. These observations suggests that the Mn3Ge goes through electronic phase transitionbelow 230 K, possibly driven by the lattice parameter of the sample.
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