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arXiv · 2509.02901

Magnetic resonance and microwave resistance modulation in van der Waals colossal-magnetoresistance material

Miuko Tanaka·Abdul Ahad·Darius-Alexandru Deaconu·Varun Shah·Daisuke Nishio-Hamane·Tomohiro Ishii·Masayuki Hashisaka·Shoya Sakamoto·Shinji Miwa·Mohammad Saeed Bahramy·Toshiya Ideue
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Abstract

Colossal magnetoresistance (CMR) is a fascinating quantum phenomenon that continues to draw significant interest in condensed matter physics. Mn3Si2Te6 has emerged as a prototypical CMR material, notable for its puzzling magnetoresistance behavior and pronounced directional anisotropy. Despite extensive research, the mechanisms driving CMR in Mn3Si2Te6 remain elusive [1-4]. In this work, we explore the magnetic resonance of Mn3Si2Te6 and observe a reduced g-factor for magnetic fields applied along the crystalline c-axis compared to the ab-plane, indicating a substantial orbital magnetization contribution along the c-axis. Furthermore, we detect resistance modulation under resonance conditions, suggesting that CMR in Mn3Si2Te6 is sensitive to the out-of-the plane spin polarization. These findings shed new light on the role of orbital magnetic moment in Mn3Si2Te6, offering a deeper understanding of the interplay between spin, orbital and lattice degrees of freedom of electrons in this system.

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Miuko Tanaka, Abdul Ahad, Darius-Alexandru Deaconu, Varun Shah, Daisuke Nishio-Hamane, Tomohiro Ishii, Masayuki Hashisaka, Shoya Sakamoto, Shinji Miwa, Mohammad Saeed Bahramy, Toshiya Ideue. 2025-12-10. Magnetic resonance and microwave resistance modulation in van der Waals colossal-magnetoresistance material. https://doi.org/10.1103/pxq5-42q6

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