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Double exchange interaction in Mn-based topological kagome ferrimagnet
Jiameng Wang1,2, Arthur Ernst3,4, Victor N Antonov5
1State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050 PR China.
Researchers explored GdMn6Sn6, a magnetic topological material. They found spin frustration and magnetic moments in tin, driven by orbital hybridization, offering insights into magnetic interactions for quantum materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Mn-based kagome materials like RMn6Sn6 show promise for quantum phenomena due to coexisting topological electronic states and magnetic order.
- A complete understanding of their electronic and magnetic properties is still lacking.
Purpose of the Study:
- Investigate the electronic structure and magnetic properties of Gadolinium Manganese Tin (GdMn6Sn6).
- Elucidate the mechanisms behind magnetic interactions and potential for magnetic tuning in topological quantum materials.
Main Methods:
- X-ray magnetic circular dichroism (XMCD) spectroscopy.
- Photoemission spectroscopy (PES).
- Theoretical electronic structure calculations.
Main Results:
- Observed localized electronic states due to spin frustration in the manganese (Mn) kagome lattice.
- Experimentally detected induced magnetic moments in nonmagnetic tin (Sn) atoms, resulting from Sn- and Mn-orbital hybridization.
- Theoretical calculations confirmed ferromagnetic coupling within the Mn-Mn kagome layer, driven by double exchange interaction.
Conclusions:
- The study reveals key insights into the electronic and magnetic properties of GdMn6Sn6.
- Orbital hybridization plays a crucial role in inducing magnetic moments and mediating interactions.
- Findings contribute to the understanding and development of magnetic tuning strategies for topological quantum materials.
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