可调谐量子自旋梯Cu（Qnx）（Cl $_{(1-x)}$ Br $_{x}$）$_{2}$
The tunable quantum spin ladder Cu(Qnx)(Cl$_{(1-x)}$Br$_{x}$)$_{2}$
摘要：
本文报道了一系列$S=1/2$自旋梯化合物Cu（Qnx）（Cl $_{(1-x)}$ Br $_{x}$）$_{2}$的磁性、比热和ESR测量结果.直到$T=2$ K，所有的观测值都可以用自旋梯模型来描述，背景中有大约1%的$S=1/2$杂质，对于整个$0\leq x\leq1$范围，这些杂质甚至存在于名义上纯的Cu（Qnx）Cl $_{2}$和Cu（Qnx）Br $_{2}$中。我们提取梯形交换常数$J_{l}(x)$和$J_{r}(x)$以及间隙值$Δ(x)$通过比较实验数据的量子Monte-Carlo模拟。由于ESR测量显示杂质的$g$因子精确地等于阶梯自旋的$g$因子，我们假设杂质是导致阶梯末端断裂的结构缺陷的结果。
英文摘要：
We report magnetic, specific heat and ESR measurements on a series of $S=1/2$ spin ladder compounds Cu(Qnx)(Cl$_{(1-x)}$Br$_{x}$)$_{2}$. Down to $T=2$ K all the observables can be described by the spin ladder model with about 1% of $S=1/2$ impurities in the background, which are present even in a nominally pure Cu(Qnx)Cl$_{2}$ and Cu(Qnx)Br$_{2}$, for the whole range of $0\leq x\leq1$. We extract ladder exchange constants $J_{l}(x)$ and $J_{r}(x)$ as well as the gap value $Δ(x)$ by comparing the experimental data to quantum Monte-Carlo simulations. As the ESR measurements show the $g$-factor of impurities to be precisely equal to $g$-factor of the ladder spins, we suppose the impurities to be the consequence of structural defects resulting in a broken ladder ends.
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