类伊辛三角反铁磁体中磁场调谐的非公度扇相
Field-tuned incommensurate fan phase in an Ising-like triangular antiferromagnet
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中文总结 AI 辅助
研究类伊辛三角晶格反铁磁体Na₂BaCo(PO₄)₂中磁场调谐的非公度相，通过单晶中子衍射观测，在半经典框架下识别为共面扇相，研究其稳定机制，还提出含层间耦合的最小交换模型再现复杂磁相图。
中文摘要 AI 辅助
利用单晶中子衍射，我们报告了在类伊辛三角晶格反铁磁体Na₂BaCo(PO₄)₂中，在略低于磁化饱和的磁场范围内观测到磁场调谐的非公度相。该相在沿伊辛轴施加磁场时出现，具有面内非公度传播矢量，随磁场变化沿六角布里渊区边界移动，挑战了系统简单的XXZ反铁磁描述。在半经典框架内，我们成功将此预饱和相识别为共面扇相，并研究了偶极 - 偶极相互作用和键依赖交换各向异性在其稳定机制中的作用。我们还提出了一个包含层间耦合的最小交换模型，该模型再现了磁场中的复杂磁相图，包括扇相中观测到的非公度传播矢量的场依赖性。
英文摘要
Using single-crystal neutron diffraction we report the observation of a field-tuned incommensurate phase in a field range just below magnetization saturation in the Ising-like triangular-lattice antiferromagnet Na$_2$BaCo(PO$_4$)$_2$. This phase occurs for magnetic fields applied along the Ising axis and exhibits an in-plane incommensurate propagation vector that moves along the hexagonal Brillouin zone boundary upon varying field, challenging the simple $XXZ$ antiferromagnetic description of the system. Within a semiclassical framework, we successfully identify this pre-saturation phase as a coplanar fan phase and study the role of dipole-dipole interactions and bond-dependent exchange anisotropy in its stabilization mechanism. We additionally present a minimal exchange model including interlayer couplings, which reproduces the complex magnetic phase diagram in field including the observed field-dependence of the incommensurate propagation vector in the fan phase.
