Topological Phase Transition and Charge-Spin Coupling in the Kagome Metal YMn6Sn6

Published

March 15, 2022

Author(s)

Peter E. Siegfried, Hari Bhandari, David C. Jones, Madhav P. Ghimire, Rebecca Dally, Lekh Poudel, Markus Bleuel, Jeffrey Lynn, Igor I. Mazin, Nirmal J. Ghimire

Abstract

The Fermi surface (FS) is essential for understanding the properties of metals. It can change under both conventional symmetry-breaking phase transitions and Lifshitz transitions (LTs), where the FS, but not the crystal symmetry, changes abruptly. Magnetic phase transitions involving uniformly rotating spin textures are conventional in nature, requiring strong spinorbit coupling (SOC) to influence the FS topology and generate measurable properties. LTs driven by a continuously varying magnetization are rarely discussed. Here we present two such manifestations in the magnetotransport of the kagome magnet YMn₆Sn₆; one caused by changes in the magnetic structure and another by a magnetization-driven LT. The former yields a 10% magnetoresistance enhancement without a strong SOC, while the latter a 45% reduction in the resistivity. These phenomena offer a unique view into the interplay of magnetism and electronic topology, crucial for understanding the rare-earth counterparts, such as TbMn₆Sn₆, recently shown to harbor novel correlated topological physics.

Citation

Nature Physics

Pub Type

Journals

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DOI Link

Keywords

topological, magnetism, magnetoresistance, Hall effect, neutron diffraction, Lifshitz transition, Fermi surface

Citation

Siegfried, P. , Bhandari, H. , Jones, D. , Ghimire, M. , Dally, R. , Poudel, L. , Bleuel, M. , Lynn, J. , Mazin, I. and Ghimire, N. (2022), Topological Phase Transition and Charge-Spin Coupling in the Kagome Metal YMn₆Sn₆, Nature Physics, [online], https://doi.org/10.1038/s42005-022-00833-2 (Accessed April 24, 2024)