arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1806.09402cond-mat.str-el
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分子自旋梯的μ子自旋谱研究

Quantum magnetism in molecular spin ladders probed with muon-spin spectroscopy

T. Lancaster, F. Xiao, B. M. Huddart, R. C. Williams, F. L. Pratt, S. J. Blundell, S. J. Clark, R. Scheuermann, T. Goko, S. Ward, J. L. Manson, Ch. Rüegg, K. W. Krämer

摘要:

本文报道了分子自旋梯体系(HPip)$_{2}$ CuBr $_{4(1-x)}$ Cl $_{4x}$ [HPip=(C $_{5}$ H $_{12}$ N)]的μ子自旋谱($μ^{+}$ SR)测量结果.使用横向场$μ^{+}$ SR,我们能够识别$x=0$强梯级自旋梯系统(HPIP)$_{2}$ CuBr $_4$的相图的每个区域中的特征行为。我们的结果与基于二聚体的分子磁体Cu(pyz)(gly)(ClO $_{4}$)的结果的比较显示了几个共同的特征。我们定位在部分无序(HPIP)$_{2}$ CuBr $_{4(1-x)}$ Cl $_{4x}$($x=0.05$)的交叉,在量子无序和Luttinger液体之间的行为中间区域被确定。我们的解释的结果结合了可能的μ子停止状态的分析(HPIP)$_{2}$ CuBr $_4$密度泛函计算的基础上,并建议如何μ子加上其本地的扭曲可以导致一个本地的探针单元具有良好的灵敏度的磁状态。使用纵向场$μ^{+}$ SR,我们比较了$x=1$强边材料(Hpip)$_{2}$ CuCl $_{4}$与强边材料(C $_{7}$ H $_{10}$ N)$_{2}$ CuBr $_{4}$(称为DIMPY)的动态响应,并证明我们的结果与基于这些材料中相互作用的费米子准粒子激发的预测一致。

英文摘要:

We present the results of muon-spin spectroscopy ($μ^{+}$SR) measurements on the molecular spin ladder system (Hpip)$_{2}$CuBr$_{4(1-x)}$Cl$_{4x}$, [Hpip=(C$_{5}$H$_{12}$N)]. Using transverse field $μ^{+}$SR we are able to identify characteristic behaviour in each of the regions of the phase diagram of the $x=0$ strong-rung spin ladder system (Hpip)$_{2}$CuBr$_4$. Comparison of our results to those of the dimer-based molecular magnet Cu(pyz)(gly)(ClO$_{4}$) shows several common features. We locate the crossovers in partially disordered (Hpip)$_{2}$CuBr$_{4(1-x)}$Cl$_{4x}$ ($x=0.05$), where a region of behaviour intermediate between quantum disordered and Luttinger liquid-like is identified. Our interpretation of the results incorporates an analysis of the probable muon stopping states in (Hpip)$_{2}$CuBr$_4$ based on density functional calculations and suggests how the muon plus its local distortion can lead to a local probe unit with good sensitivity to the magnetic state. Using longitudinal field $μ^{+}$SR we compare the dynamic response of the $x=1$ strong-rung material (Hpip)$_{2}$CuCl$_{4}$ to that of the strong-leg material (C$_{7}$H$_{10}$N)$_{2}$CuBr$_{4}$ (known as DIMPY) and demonstrate that our results are in agreement with predictions based on interacting fermionic quasiparticle excitations in these materials.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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