Anomalous and large topological Hall effects in β-Mn chiral compound Co6.5Ru1.5Zn8Mn4: electron electron interaction facilitated quantum interference effect

Afsar Ahmed; Arnab Bhattacharya; I Das

doi:10.1088/1361-648X/ada59f

Anomalous and large topological Hall effects in β-Mn chiral compound Co_6.5Ru_1.5Zn₈Mn₄: electron electron interaction facilitated quantum interference effect

J Phys Condens Matter. 2025 Jan 21;37(11). doi: 10.1088/1361-648X/ada59f.

Authors

Afsar Ahmed¹, Arnab Bhattacharya¹, I Das¹

Affiliation

¹ CMP Division, Saha Institute of Nuclear Physics, A CI of Homi Bhabha National Institute, Kolkata 700064, India.

PMID: 39752879
DOI: 10.1088/1361-648X/ada59f

Abstract

β-Mn-type chiral cubic Co_xZn_yMn_z(x+y+z= 20) alloys present a intriguing platform for exploring topological magnetic orderings with promising spintronic potential. This study examines the magnetotransport properties of Co_6.5Ru_1.5Zn₈Mn₄, a skyrmion-hostingβ-Mn-type chiral compound. The longitudinal resistivity (ρ_xx) exhibits field-insensitive low-temperature minima due to quantum interference effects, driven byT1/2-dependent electron-electron interactions. We observe a substantial intrinsic anomalous Hall conductivity, unaffected by quantum interference. Additionally, a pronounced topological Hall effect is observed at the metastable skyrmionic state, persisting up toTCand achieving notable magnitudes for stoichiometric compounds. These results position the Co_xZn_yMn_zfamily favourably to leverage the rich pallete of emergent magnetotransport properties for spintronic applications.

Keywords: anomalous Hall effect; chiral magnets; magnetotransport; topological Hall effect.