论文标题
沮丧的铁磁$ J_1 $ - $ J_2 $链材料Linarite，pbcuso $ _4 $（哦）$ _ 2 $，在应用磁场中
Low-energy spin excitations of the frustrated ferromagnetic $J_1$-$J_2$ chain material linarite, PbCuSO$_4$(OH)$_2$, in applied magnetic fields $\mathbf{H} \parallel b$ axis
论文作者
论文摘要
我们报告了对沮丧的铁磁$ j_1 $ - $ j_2 $链条复合linarite，pbcuso $ _4 $（oh）$ _ 2 $的旋转动力学的研究。通过一个极端环境的无弹性中子散射实验，我们测量了$ \ Mathbf {h} \ parallel b $ axis的字段中Linarite的低能旋转激发。我们已经沿$ h $，$ k $和$ l $的旋转激发光谱录制了磁引起的磁性阶段IV，V和接近饱和的场极化状态。通过采用第一原理计算，我们估计了$ bc $平面的领先磁交换，并使用线性自旋波理论对分散关系进行建模。通过这种方式，我们找到了（非常弱的）残余磁性交换的证据，从$ bc $平面耦合。连同先前建立的主体内部耦合$ J_1 $和$ J_2 $以及链链耦合$ J_3 $，我们得出了一组有效的交换耦合，用于对Linarite的显微镜描述。此外，我们发现相V的特殊特征在测得的自旋动力学中表现出来。
We report a study of the spin dynamics of the frustrated ferromagnetic $J_1$-$J_2$ chain compound linarite, PbCuSO$_4$(OH)$_2$, in applied magnetic fields up to field polarization. By means of an extreme-environment inelastic neutron scattering experiment, we have measured the low-energy spin excitations of linarite in fields up to 8.8 T for $\mathbf{H} \parallel b$ axis. We have recorded the spin excitation spectra along $h$, $k$ and $l$ for the field-induced magnetic phases IV, V and the field polarized state close to saturation. By employing first-principles calculations, we estimate the leading magnetic exchanges out of the $bc$ plane and model the dispersion relations using linear spin-wave theory. In this way, we find evidence for a (very weak) residual magnetic exchange coupling out of the $bc$ plane. Together with the previously established dominant intrachain couplings $J_1$ and $J_2$ and the interchain coupling $J_3$, we derive an effective set of exchange couplings for a microscopic description of linarite. Further, we find that the peculiar character of phase V manifests itself in the measured spin dynamics.
