2025/02/05 by Jyoti Sharma, Ahmed, Afsar, Arnab Bhattacharya +12
Biochemistry, Genetics and Molecular Biology · Engineering · Materials Science · #FOS: Physical sciences #Geomagnetism and Paleomagnetism Studies #Magnetic Bearings and Levitation Dynamics #Magnetic Properties of Alloys #Materials Science (cond-mat.mtrl-sci)
paper · pdf · doi:10.48550/arxiv.2502.03452
openalex publication_date 2025/02/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report a rare realization of unconventional anomalous Hall effect (UAHE) both below and above the magnetic transition temperature (TC) in a hexagonal noncentrosymmetric magnet Y3Co8Sn4, using a combined experimental and ab-initio calculations. Occurrence of such UAHE is mainly attributed to the reciprocal (KS) topology (i.e. the presence of topological Weyl points at/near the Fermi level), along with some contribution from the topological magnetic texture, as inferred from the measured field-dependent ac susceptibility. The effect of UAHE on the measured transport behavior however evolves differently with temperature above and below TC, suggesting different physical mechanism responsible in the two phases. A unique planar ferrimagnetic ordering is found to be the most stable state with ab-plane as the easy plane below TC, as observed experimentally. The simulated net magnetization and the moment per Co atom agrees fairly well with the measured values. A reasonably large AHC is also observed in both the phases (above and below and TC) of the present compound, which is again not so ubiquitous. Our results underscore the family of R3Co8Sn4 (R= rare earth) polar magnets as a compelling backdrop for exploring the synergy of topological magnetism and non-trivial electronic bands, pivotal for spintronic applications.