Magnetic Anisotropies and Skyrmion Lattice Related to Magnetic Quadrupole Interactions of the RKKY Mechanism in Frustrated Spin-Trimer System Gd₃Ru₄Al₁₂ with a Breathing Kagome Structure

2024/12/21 by Shintaro Nakamura, Nakamura, Shintaro
Physics and Astronomy · #Advanced Condensed Matter Physics #Atomic and Molecular Clusters (physics.atm-clus) #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Theoretical and Computational Physics #Topological Materials and Phenomena

paper · pdf · doi:10.48550/arxiv.2412.16562

openalex publication_date 2024/12/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The origin of the magnetic quadrupole (MQ) interactions in Gd₃Ru₄Al₁₂ which is known as a frustrated spin system and as a host material of skyrmion with a sentrosymmetric crystal structure are discussed. The MQ interactions between ferromagnetic (FM) spin trimers with imperfect FM directivity are deduced from synthesis of dipole Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions. The Hamiltonian which includes both the MQ interactions and dipole interactions is proposed, and magnetic anisotropies, magnetic phase transitions and contribution of the MQ interactions to stabilize the skyrmion lattice (SkL) are discussed based on this Hamiltonian. Degrees of MQ freedom carried by the trimers contribute to stabilizing SkL which appears at finite temperatures.

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