$S={5\over2}$反铁磁体CaFe $_{2}$ O $_{4}$中的孤磁振子
Solitary magnons in the $S={5\over2}$ antiferromagnet CaFe$_{2}$O$_{4}$
摘要：
CaFe $_{2}$ O $_{4}$是一种$S={5\over 2}$各向异性反铁磁体，基于具有两种竞争磁性结构的Z字形链，表示为A（$\uparrow \uparrow \downarrow \downarrow$）和B（$\uparrow \downarrow \uparrow \downarrow$）相，其不同之处在于铁磁条的$c$轴堆叠。我们应用中子散射来证明，竞争的A和B相序参数的结果在磁反相边界沿$c$冻结在$\sim$ 1 ns的时间尺度上在200 K的磁序开始。利用高分辨中子能谱，我们发现了量子化自旋波能级，并测量了9个位于$\sim$ 1-2区$c$轴晶格常数的量子化自旋波能级。我们将讨论这些预测存在于各向异性系统中的孤立磁振子的背景下。磁各向异性提供了竞争的A+B订单，以及本地化的自旋激发在一个经典的磁铁。
英文摘要：
CaFe$_{2}$O$_{4}$ is a $S={5\over 2}$ anisotropic antiferromagnet based upon zig-zag chains having two competing magnetic structures, denoted as the A ($\uparrow \uparrow \downarrow \downarrow$) and B ($\uparrow \downarrow \uparrow \downarrow$) phases, which differ by the $c$-axis stacking of ferromagnetic stripes. We apply neutron scattering to demonstrate that the competing A and B phase order parameters results in magnetic antiphase boundaries along $c$ which freeze on the timescale of $\sim$ 1 ns at the onset of magnetic order at 200 K. Using high resolution neutron spectroscopy, we find quantized spin wave levels and measure 9 such excitations localized in regions $\sim$ 1-2 $c$-axis lattice constants in size. We discuss these in the context of solitary magnons predicted to exist in anisotropic systems. The magnetic anisotropy affords both competing A+B orders as well as localization of spin excitations in a classical magnet.
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