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arXiv 0709.2560cond-mat.stat-mech
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蓝铜矿自旋动力学和1/3磁化平台的性质

Nature of the spin dynamics and 1/3 magnetization plateau in azurite

K. C. Rule, A. U. B. Wolter, S. Süllow, D. A. Tennant, A. Brühl, S. Köhler, B. Wolf, M. Lang, J. Schreuer

摘要:

本文用比热和非弹性中子散射方法研究了金刚石链状化合物蓝铜矿Cu $_3$(CO $_3$)$_2$(OH)$_2$的1/3磁化平台相。我们确定磁化平台是二聚体-单体状态,{\it即},由$S = 1/2$单体链组成,所述单体链被金刚石链骨架上的$S = 0$二聚体隔开。有效的自旋偶合$J_{mono}/k_B = 10.1(2)$ K和$J_{dimer}/k_B = 1.8(1)$ K来自单体和二聚体分散体。它们与微观耦合$J_1/k_B = 1(2)$ K、$J_2/k_B = 55(5)$ K和铁磁$J_3/k_B = -20(5)$ K有关,可能是由于Cu-O键中的$d_{z^2}$轨道提供了超交换途径。

英文摘要:

We present a specific heat and inelastic neutron scattering study in magnetic fields up into the 1/3 magnetization plateau phase of the diamond chain compound azurite Cu$_3$(CO$_3$)$_2$(OH)$_2$. We establish that the magnetization plateau is a dimer-monomer state, {\it i.e.}, consisting of a chain of $S = 1/2$ monomers, which are separated by $S = 0$ dimers on the diamond chain backbone. The effective spin couplings $J_{mono}/k_B = 10.1(2)$ K and $J_{dimer}/k_B = 1.8(1)$ K are derived from the monomer and dimer dispersions. They are associated to microscopic couplings $J_1/k_B = 1(2)$ K, $J_2/k_B = 55(5)$ K and a ferromagnetic $J_3/k_B = -20(5)$ K, possibly as result of $d_{z^2}$ orbitals in the Cu-O bonds providing the superexchange pathways.

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