Anisotropic magnetism and band evolution induced by ferromagnetic phase transition in titanium-based kagome ferromagnet SmTi3Bi4

Kagome magnets with diverse topological quantum responses are crucial for next-generation topological engineering. The anisotropic magnetism and band evolution induced by ferromagnetic phase transition (FMPT) is reported in a newly discovered titanium-based kagome ferromagnet S mTi3 Bi4, which featu...

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Bibliographic Details
Published in:arXiv.org 2024-02
Main Authors: Zheng, Zhe, Long, Chen, Ji, Xuecong, Zhou, Ying, Qu, Gexing, Hu, Mingzhe, Huang, Yaobo, Weng, Hongming, Tian Qian, Wang, Gang
Format: Article
Language:English
Subjects:
Broken symmetry
Crystallography
Electronic properties
Electronic structure
Electrons
Evolution
Ferromagnetic materials
Ferromagnetic phases
First principles
Kagome lattice
Magnetic anisotropy
Magnetic permeability
Magnetic properties
Magnetism
Magnets
Phase transitions
Photoelectric emission
Temperature dependence
Titanium
Topology
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Summary:Kagome magnets with diverse topological quantum responses are crucial for next-generation topological engineering. The anisotropic magnetism and band evolution induced by ferromagnetic phase transition (FMPT) is reported in a newly discovered titanium-based kagome ferromagnet S mTi3 Bi4, which features a distorted Ti kagome lattice and S m atomic zig-zag chains. Temperature-dependent resistivity, heat capacity, and magnetic susceptibility reveal a ferromagnetic ordering temperature Tc of 23.2 K. A large magnetic anisotropy, observed by applying the magnetic field along three crystallographic axes, identifies the b axis as the easy axis. Angle-resolved photoemission spectroscopy with first-principles calculations unveils the characteristic kagome motif, including the Dirac point at the Fermi level and multiple van Hove singularities. Notably, a band splitting and gap closing attributed to FMPT is observed, originating from the exchange coupling between S m 4 f local moments and itinerant electrons of the kagome Ti atoms, as well as the time-reversal symmetry breaking induced by the long-range ferromagnetic order. Considering the large in-plane magnetization and the evolution of electronic structure under the influence of ferromagnetic ordering, such materials promise to be a new platform for exploring the intricate electronic properties and magnetic phases based on the kagome lattice.
ISSN:2331-8422
DOI:10.48550/arxiv.2308.14349