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arXiv 1109.1369cond-mat.str-el
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用中子散射法研究了蓝铜矿Cu $_3$(CO $_3$)$_2$(OH)$_2$在磁场中的动力学

The dynamics of azurite Cu$_3$(CO$_3$)$_2$(OH)$_2$ in a magnetic field as determined by neutron scattering

K. C. Rule, D. A. Tennant, J. -S. Caux, M. C. R. Gibson, M. T. F. Telling, S. Gerischer, S. Süllow, M. Lang

摘要:

蓝铜矿是一种由CuO链组成的天然矿物,也是一种有趣的自旋1/2量子磁体。关于这种材料的一维(1D)性质,理论家和实验家都有很多争论。这场争论的焦点在于1.9K以下反铁磁有序态中铜离子之间的相互作用。我们提出了高分辨率的非弹性中子散射数据,突出了复杂的磁性基态的蓝铜矿。应用磁场和温度来探测激发,揭示了该系统动力学的重要信息。由此我们可以得出结论,一维海森堡反铁磁自旋链模型不足以描述蓝铜矿中的动力学。相反,额外的耦合,包括链间相互作用和各向异性交错场是必要的,以充分模拟所观察到的激发。

英文摘要:

Azurite, a natural mineral made up of CuO chains, is also an intriguing spin-1/2 quantum magnet. There has been much debate as to the 1-dimensional (1D) nature of this material by theorists and experimentalists alike. The focus of this debate lies in the interactions between Cu-ions within the antiferromagnetically ordered state below 1.9 K. We present high-resolution inelastic neutron scattering data which highlight the complexity of the magnetic ground state of azurite. The application of magnetic fields and temperatures were used to probe the excitations revealing important information about the dynamics in this system. From this we are able to conclude that the 1D Heisenberg antiferromagnetic spin chain model is not sufficient to describe the dynamics in azurite. Instead additional coupling including interchain interactions and an anisotropic staggered field are necessary to fully model the observed excitations.

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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