论文标题
spin-3/2中的散布自旋波，零模式和簇激发kagoméantyantAntiferRomagnetchromium jarosite，kcr $ _3 $（od）$ _ 6 $（SO $ _4 $）$ _ 2 $
Diffuse spin waves, zero modes and cluster excitations in the spin-3/2 kagomé antiferromagnet chromium jarosite, KCr$_3$(OD)$_6$(SO$_4$)$_2$
论文作者
论文摘要
The dynamics of the S = 3=2 kagome antiferromagnet chromium jarosite, KCr$_3$(OD)$_6$(SO$_4$)$_2$ was studied using high-resolution neutron time-of-flight spectroscopy on a polycrystalline sample with a nearly stoichiometric magnetic lattice (2.8(2)% Cr vacancies).中子光谱法揭示了在有序阶段的弥漫性旋转波激发，其间隙不完整，有限的寿命扩大以及明显的零模式。使用线性自旋波理论，我们估计交换耦合，主要的最近邻居值为$ J_1 $ = 0：884 MEV。从合作parmagnetism中占主导地位的$ T_N $弥漫性激发。证明了二维磁聚类激发的模型，可在合作的顺磁性阶段捕获数据的基本特征。
The dynamics of the S = 3=2 kagome antiferromagnet chromium jarosite, KCr$_3$(OD)$_6$(SO$_4$)$_2$ was studied using high-resolution neutron time-of-flight spectroscopy on a polycrystalline sample with a nearly stoichiometric magnetic lattice (2.8(2)% Cr vacancies). Neutron spectroscopy reveals diffuse spin wave excitations in the ordered phase with an incomplete gap and significant finite life-time broadening as well as a pronounced zero mode. Using linear spin wave theory, we estimate the exchange couplings, with the leading nearest neighbor value being $J_1$ = 0:884 meV. Above $T_N$ diffuse excitations from cooperative paramagnetism dominate. A model for two-dimensional magnetic cluster excitations is shown to capture the essential features of the data in the cooperative paramagnetic phase.
