Breakdown of Anomalous Hall Scaling in Dilute Kondo System
Abstract
The confluence of strong electronic correlations and Berry curvature-driven transport constitutes a largely underexplored frontier in quantum materials research, particularly in systems where electronic correlations arise from flat-band physics rather than conventional f-electron states. Here, we report an intrinsic Berry curvature driven anomalous Hall transport in the dilute Kondo system Ru2Mn0.5Ti0.5Ge, a non-f-electron Heusler alloy hosting flat bands with van Hove singularity proximate to the Fermi level. The anomalous Hall response is strikingly non-monotonic, violating the Fermi-liquid scaling relation near the magnetic transition and is restored only at low temperature, coincident with the onset of Kondo coherence. \textit{Ab initio} calculations strongly establish that the Berry curvature originates from the Kondo hybridization induced interplay of flat bands and spin-orbit coupling mediated anticrossings at the Fermi level. Our findings demonstrate that Kondo coherence of flat bands bears a profound impact on Berry curvature associated ferroic responses, mandating a rigorous theoretical understanding of anomalous transport in the regime where reciprocal space topology and strong correlations are intrinsically intertwined.
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BibTeX
@misc{bhattacharya2026breakdown,
title = {{Breakdown of Anomalous Hall Scaling in Dilute Kondo System}},
author = {Arnab Bhattacharya and Prashant Singh and Ajay Kumar and Afsar Ahmed and Yaroslav Mudryk and I. Das and Anis Biswas},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.05319},
eprint = {2609.05319},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.05319},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Breakdown of Anomalous Hall Scaling in Dilute Kondo System
AU - Arnab Bhattacharya
AU - Prashant Singh
AU - Ajay Kumar
AU - Afsar Ahmed
AU - Yaroslav Mudryk
AU - I. Das
AU - Anis Biswas
PY - 2026
DA - 2026/09/04
PB - arXiv
DO - 10.48550/arxiv.2609.05319
UR - https://arxiv.org/abs/2609.05319
AB - The confluence of strong electronic correlations and Berry curvature-driven transport constitutes a largely underexplored frontier in quantum materials research, particularly in systems where electronic correlations arise from flat-band physics rather than conventional f-electron states. Here, we report an intrinsic Berry curvature driven anomalous Hall transport in the dilute Kondo system Ru_2Mn_0.5Ti_0.5Ge, a non-f-electron Heusler alloy hosting flat bands with van Hove singularity proximate to the Fermi level. The anomalous Hall response is strikingly non-monotonic, violating the Fermi-liquid scaling relation near the magnetic transition and is restored only at low temperature, coincident with the onset of Kondo coherence. \textit{Ab initio} calculations strongly establish that the Berry curvature originates from the Kondo hybridization induced interplay of flat bands and spin-orbit coupling mediated anticrossings at the Fermi level. Our findings demonstrate that Kondo coherence of flat bands bears a profound impact on Berry curvature associated ferroic responses, mandating a rigorous theoretical understanding of anomalous transport in the regime where reciprocal space topology and strong correlations are intrinsically intertwined.
ER -