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arXiv 2602.11983cond-mat.str-el
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S=5/2近抗铁磁三角晶格反铁磁体K2Mn(SeO3)2的动力学与热力学

Dynamics and thermodynamics of the S = 5/2 almost Heisenberg triangular lattice antiferromagnet K2Mn(SeO3)2

ETH Zürich(苏黎世联邦理工学院);Helmholtz-Zentrum Dresden-Rossendorf(德累斯顿-罗森多夫亥姆霍兹中心);PSI Center for Neutron and Muon Sciences(瑞士保罗谢勒研究所中子与μ子科学中心);University of California, Irvine(加州大学尔湾分校)

Mengze Zhu, V. Romerio, D. Moser, K. Yu. Povarov, R. Sibille, R. Wawrzynczak, Z. Yan, S. Gvasaliya, A. L. Chernyshev, A. Zheludev

AI总结:

研究S=5/2近Heisenberg三角晶格反铁磁体K2Mn(SeO3)2的热力学与动力学特性,发现多种磁相,包括零场下的非collinear Y相、磁场诱导的m=1/3磁化平台以及高场下的V相,揭示了大S Heisenberg自旋系统中磁子-磁子相互作用的重要性。

摘要:

我们报告了对S=5/2、近Heisenberg三角晶格反铁磁体K2Mn(SeO3)2的热学、磁学和中子散射研究,该材料具有弱XXZ易轴各向异性。识别出多种磁相,包括零场下的非collinear Y相、磁场诱导的m=1/3磁化平台以及高场下的V相。在Y相中,磁激发谱表现出单磁子激发和扩展的高能连续谱。这两种特征均能通过非线性自旋波理论良好描述。在磁场诱导相中,谱重整化复杂效应即使在大S=5/2材料中也明显可检测。这些结果突显了大S Heisenberg自旋系统在三角晶格上动力学中磁子-磁子相互作用的关键作用。

英文摘要:

We report calorimetric, magnetic, and neutron scattering studies on an S = 5/2, nearly Heisenberg triangular-lattice antiferromagnet K2Mn(SeO3)2 with weak XXZ easy-axis anisotropy. Multiple magnetic phases are identified, including a non-collinear Y phase in zero field, a field-induced collinear m = 1/3 magnetization plateau, and a high-field V phase. In the Y phase, the magnetic excitation spectrum exhibits both single-magnon excitations and an extended high-energy continuum. Both features are well described by non-linear spin wave theory. In the field-induced phases, complex effects of the spectrum renormalization even for large S = 5/2 material are clearly detectable. These results underscore the essential role of magnon-magnon interactions in the dynamics of large-S Heisenberg spin systems on a triangular lattice.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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