准一维CuSe $_2$ O $_5$的对称和反对称交换各向异性（ESR）
Symmetric and antisymmetric exchange anisotropies in quasi-one-dimensional CuSe$_2$O$_5$ as revealed by ESR
摘要：
我们提出了一个电子自旋共振（ESR）研究单晶自旋链系统CuSe $_2$ O $_5$在9 GHz和450 GHz之间的频率范围。在高于Néel温度$T_N=17$ K的宽温度范围内，我们观察到共振线宽的强和各向异性的频率依赖性。虽然该体系中存在相当大的链间相互作用$J_{IC}\approx 0.1 J$（$J$为链内相互作用），但ESR结果与一维$S=1/2$海森堡反铁磁体的Oshikawa-Affleck理论符合得很好.该理论用于提取CuSe $_2$ O $_5$中存在的各向异性。我们发现对称各向异性交换$J_c=(0.04 \pm 0.01) \:J$和反对称Dzyaloshinskiii-Moriya（DM）相互作用$D=(0.05\pm 0.01)\:J$在该系统中的大小非常相似.在宏观磁化率各向异性中，可以看到DM相互作用引起的交错场磁化率。
英文摘要：
We present an electron spin resonance (ESR) study of single-crystalline spin chain-system CuSe$_2$O$_5$ in the frequency range between 9 GHz and 450 GHz. In a wide temperature range above the Néel temperature $T_N=17$ K we observe strong and anisotropic frequency dependence of a resonance linewidth. Although sizeable interchain interaction $J_{IC}\approx 0.1 J$ ($J$ is the intrachain interaction) is present in this system, the ESR results agree well with the Oshikawa-Affleck theory for one-dimensional $S=1/2$ Heisenberg antiferromagnet. This theory is used to extract the anisotropies present in CuSe$_2$O$_5$. We find that the symmetric anisotropic exchange $J_c=(0.04 \pm 0.01) \:J$ and the antisymmetric Dzyaloshinskii-Moriya (DM) interaction $D=(0.05\pm 0.01)\:J$ are very similar in size in this system. Staggered-field susceptibility induced by the presence of the DM interaction is witnessed in the macroscopic susceptibility anisotropy.
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