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



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


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.
Nature Physics


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


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 YMn<sub>6</sub>Sn<sub>6</sub>, Nature Physics, [online], (Accessed June 24, 2024)


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Created March 15, 2022, Updated November 29, 2022