量子磁体二硝酸吡嗪铜的低频自旋动力学
Low frequency spin dynamics in the quantum magnet copper pyrazine dinitrate
摘要：
S=1/2反铁磁海森堡链存在一个磁场驱动的量子临界点.我们用$^{13}$ C-NMR谱研究了吡嗪二硝酸铜（CuPzN）的低频自旋动力学，这是量子磁性模型系统的一种实现.在饱和场附近的核自旋-晶格弛豫速率$T_1^{-1}$的测量进行了比较与量子Monte Carlo计算的动态结构因子。两者都表现出较强的分歧，低能量激发温度在量子制度。各向异性的$T_1^{-1}$率和频率偏移的分析允许一个解开的贡献从横向和纵向自旋波动的选择性研究，并确定转移离域自旋矩从铜到相邻的氮原子。
英文摘要：
The S=1/2 antiferromagnetic Heisenberg chain exhibits a magnetic field driven quantum critical point. We study the low frequency spin dynamics in copper pyrazine dinitrate (CuPzN), a realization of this model system of quantum magnetism, by means of $^{13}$C-NMR spectroscopy. Measurements of the nuclear spin-lattice relaxation rate $T_1^{-1}$ in the vicinity of the saturation field are compared with quantum Monte Carlo calculations of the dynamic structure factor. Both show a strong divergence of low energy excitations at temperatures in the quantum regime. The analysis of the anisotropic $T_1^{-1}$-rates and frequency shifts allows one to disentangle the contributions from transverse and longitudinal spin fluctuations for a selective study and to determine the transfer of delocalized spin moments from copper to the neighboring nitrogen atoms.
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