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Condensed Matter > Materials Science
Title: Anisotropic Nonsaturating Magnetoresistance Observed in HoMn$_6$Ge$_6$: A Kagome Dirac Semimetal
(Submitted on 17 Apr 2024 (v1), last revised 18 Apr 2024 (this version, v2))
Abstract: We report the magnetic and magnetotransport properties and electronic band structure of the kagome Dirac semimetal HoMn$_6$Ge$_6$. Temperature-dependent electrical resistivity demonstrates various magnetic-transition-driven anomalies. Notably, a crossover from negative to positive magnetoresistance (MR) is observed at around 150 K. While the linear nonsaturating positive MR in the low-temperature region is mainly driven by the linear Dirac-like band dispersions as predicted by the first-principles calculations, the negative MR observed in the high-temperature region is due to the spin-flop type magnetic transition. Consistent with anisotropic Fermi surface topology, we observe anisotropic magnetoresistance at low temperatures. A significant anomalous Hall effect has been noticed at high temperatures in addition to a switching of the dominant charge carrier from electron to hole at around 215 K.
Submission history
From: Setti Thirupathaiah Dr [view email][v1] Wed, 17 Apr 2024 14:14:09 GMT (1223kb,D)
[v2] Thu, 18 Apr 2024 04:35:54 GMT (1223kb,D)
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