标题： SrCu$_2$O$_3$的自旋动力学和海森堡梯子 显示英文标题

标题： Spin dynamics of SrCu$_2$O$_3$ and the Heisenberg ladder

摘要： 在梯子几何结构中研究了$S=1/2$量子反铁磁体，作为 SrCu$_2$O$_3$自旋自由度的模型。 通过量子蒙特卡罗技术计算了磁化率和自旋回波衰减率，并通过虚时关联函数的最大熵解析延拓得到了自旋-晶格弛豫率。 如果交换耦合$J \approx 850$K，即显著小于高温$_c$铜氧化物中的值，所有计算结果与 SrCu$_2$O$_3$的实验结果有合理的吻合。 显示英文摘要

摘要： The $S=1/2$ Heisenberg antiferromagnet in the ladder geometry is studied as a model for the spin degrees of freedom of SrCu$_2$O$_3$. The susceptibility and the spin echo decay rate are calculated using a quantum Monte Carlo technique, and the spin-lattice relaxation rate is obtained by maximum entropy analytic continuation of imaginary time correlation functions. All calculated quantities are in reasonable agreement with experimental results for SrCu$_2$O$_3$ if the exchange coupling $J \approx 850$K, i.e. significantly smaller than in high-T$_c$ cuprates.