利用可调谐频率的电子自旋共振探测了自旋为1/2的链状化合物（C $_6$ H $_9$ N $_2$）CuCl $_3$ [称为（6 MAP）CuCl $_3$ ]的低能磁激发。两种模式与不对称（相对于$hν=gμ_B B$线）的频率场依赖性的解决，照亮了一个简单的统一的$S=\frac{1}{2}$海森堡链模型惊人的不兼容性。不寻常的ESR谱解释的自旋1/2链的最新发展的理论，表明次近邻相互作用在该化合物中的重要作用。对（6 MAP）CuCl $_3$磁化率的模型计算支持了我们的结论，并与实验结果进行了定性的比较。
英文摘要：
Low-energy magnetic excitations in the spin-1/2 chain compound (C$_6$H$_9$N$_2$)CuCl$_3$ [known as (6MAP)CuCl$_3$] are probed by means of tunable-frequency electron spin resonance. Two modes with asymmetric (with respect to the $hν=gμ_B B$ line) frequency-field dependences are resolved, illuminating the striking incompatibility with a simple uniform $S=\frac{1}{2}$ Heisenberg chain model. The unusual ESR spectrum is explained in terms of the recently developed theory for spin-1/2 chains, suggesting the important role of next-nearest-neighbor interactions in this compound. Our conclusion is supported by model calculations for the magnetic susceptibility of (6MAP)CuCl$_3$, revealing a good qualitative agreement with experiment.
Ground-State Phase Diagram of the Effective Model with Antiferromagnetic Nearest-Neighbor and Ferromagnetic Next-Nearest-Neighbor Interactions in 1/1 Periodic Approximants to Icosahedral Quasicrystals
