清洁磁体中量子涨落的定量确定 I：中子自旋回声
Quantitative Determination of Quantum Fluctuations in Clean Magnets I: Neutron Spin Echo
AI总结：
本文通过中子自旋回声光谱学，提出一种直接测量清洁磁体中量子涨落强度的方法，并通过计算验证了量子自旋减少和几何失衡对平台值的抑制作用。
摘要：
从中子散射的磁总矩求和规则出发，我们推导出有序矩减少与中间散射函数长时间极限之间的显式联系。我们证明，这种时域公式通过中子自旋回声光谱学建立了量子涨落强度的直接且实验可及的度量，公式为[P(t→∞)=I(Q,t→∞)/I(Q,t=0)=⟨μ⟩²/⟨μ²⟩]。这个恒等式将长时间极化与有序和总磁矩的比值联系起来。对于正方形和三角形反铁磁Heisenberg磁体的线性自旋波计算显示，量子自旋减少和几何失衡都定量地抑制了平台值，与矩减少一致。由此建立的框架为bulk量子磁体中量子涨落的水平提供了直接且模型无关的度量，特别是对于多晶样品。
英文摘要：
Starting from the magnetic total-moment sum rule of neutron scattering, we derive an explicit connection between ordered-moment reduction and the long-time limit of the intermediate scattering function. We show that this time-domain formulation establishes a direct and experimentally accessible measure of quantum fluctuation strength through neutron spin-echo spectroscopy, with \[P(t\rightarrow\infty)=\frac{I(Q,t\rightarrow\infty)}{I(Q,t=0)}=\frac{\langle μ\rangle^{2}}{\langle μ^{2} \rangle}\] This identity links the long-time polarization to the ratio between ordered and total magnetic moments. Linear spin-wave calculations for square and triangular Heisenberg antiferromagnets demonstrate that both quantum spin reduction and geometric frustration suppress the plateau value in quantitative agreement with moment reduction. The resulting framework establishes a direct and model-independent measure of the level of quantum fluctuations in bulk quantum magnets, particularly for polycrystalline samples.
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。
