磁场作用下IPA-CuCl3中量子自旋液体和自旋固相的动力学
Dynamics of quantum spin liquid and spin solid phases in IPA-CuCl3 under field
摘要：
利用非弹性和弹性中子散射研究了强磁场中准一维量子反铁磁体IPA-CuCl 3的自旋关联。在临界场$H_c=9.5$ T下观察到磁振子的凝聚和相应的横向长程有序。所有磁振子分支的能量和极化的场依赖性的调查都低于和高于过渡点。在高达14 T的磁场中测量了它们在整个1D布里渊区的色散。磁振子谱截断的临界波矢[Masuda et al.，物理修订信函96，047210（2006）]发现在H>H_c时，从h_c 0.35偏移。有序相位中磁振子带宽的急剧减少[Garlea等人，物理修订版信函98，167202（2007）]进行了详细的观察和研究。光谱的新特征，大概与这种带宽崩溃，观察到以上的过渡领域。
英文摘要：
Inelastic and elastic neutron scattering is used to study spin correlations in the quasi-one dimensional quantum antiferromagnet IPA-CuCl3 in strong applied magnetic fields. A condensation of magnons and commensurate transverse long-range ordering is observe at a critical filed $H_c=9.5$ T. The field dependencies of the energies and polarizations of all magnon branches are investigated both below and above the transition point. Their dispersion is measured across the entire 1D Brillouin zone in magnetic fields up to 14 T. The critical wave vector of magnon spectrum truncation [Masuda et al., Phys. Rev. Lett. 96, 047210 (2006)] is found to shift from h_c 0.35 at H>H_c. A drastic reduction of magnon bandwidths in the ordered phase [Garlea et al., Phys. Rev. Lett. 98, 167202 (2007)] is observed and studied in detail. New features of the spectrum, presumably related to this bandwidth collapse, are observed just above the transition field.
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