高阻挫正方形晶格流动磁体CaCo $_{\mathrm{2}-y}$ As $_{2}$中的有效一维耦合
Effective One-Dimensional Coupling in the Highly-Frustrated Square-Lattice Itinerant Magnet CaCo$_{\mathrm{2}-y}$As$_{2}$
摘要：
非弹性中子散射测量巡游反铁磁体（AFM）的CaCo $_{\mathrm{2}-y}$作为$_{2}$在8 K的温度下揭示了两个正交的散射平面垂直于在倒易空间中的Co正方形晶格，证明了有效的一维自旋相互作用的存在。这些结果表明，产生的近完美的键挫内的$J_1$ - $J_2$海森堡模型的正方形晶格与铁磁$J_1$，因此表明，广泛的先前的实验和理论研究的$J_1$ - $J_2$海森堡模型的局域矩正方形自旋晶格应扩展到包括巡回自旋系统。
英文摘要：
Inelastic neutron scattering measurements on the itinerant antiferromagnet (AFM) CaCo$_{\mathrm{2}-y}$As$_{2}$ at a temperature of 8 K reveal two orthogonal planes of scattering perpendicular to the Co square lattice in reciprocal space, demonstrating the presence of effective one-dimensional spin interactions. These results are shown to arise from near-perfect bond frustration within the $J_1$-$J_2$ Heisenberg model on a square lattice with ferromagnetic $J_1$, and hence indicate that the extensive previous experimental and theoretical study of the $J_1$-$J_2$ Heisenberg model on local-moment square spin lattices should be expanded to include itinerant spin systems.
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