Institut für Theoretische Physik, Georg-August-Universität Göttingen, 37077 Göttingen, Germany.
J Phys Condens Matter. 2011 Apr 27;23(16):164211. doi: 10.1088/0953-8984/23/16/164211. Epub 2011 Apr 6.
The natural mineral azurite Cu(3)(CO(3))(2)(OH)(2) is an interesting spin-1/2 quantum antiferromagnet. Recently, a generalized diamond chain model has been established as a good description of the magnetic properties of azurite with parameters placing it in a highly frustrated parameter regime. Here we explore further properties of this model for azurite. First, we determine the inelastic neutron scattering spectrum in the absence of a magnetic field and find good agreement with experiments, thus lending further support to the model. Furthermore, we present numerical data for the magnetocaloric effect and predict that strong cooling should be observed during adiabatic (de)magnetization of azurite in magnetic fields slightly above 30 T. Finally, the presence of a dominant dimer interaction in azurite suggests the use of effective Hamiltonians for an effective low-energy description and we propose that such an approach may be useful for fully accounting for the three-dimensional coupling geometry.
天然矿物蓝铜矿 Cu(3)(CO(3))(2)(OH)(2) 是一种有趣的自旋 1/2 量子反铁磁体。最近，已经建立了一个广义的金刚石链模型，作为对蓝铜矿磁性质的一个很好的描述，其参数将其置于一个高度受挫的参数区域。在这里，我们进一步探索了这个模型对蓝铜矿的性质。首先，我们确定了在没有磁场的情况下的非弹性中子散射谱，并发现与实验很好地吻合，从而进一步支持了这个模型。此外，我们还给出了蓝铜矿磁热效应的数值数据，并预测在磁场略高于 30 T 的情况下，蓝铜矿的绝热（去）磁化过程中应该会观察到强烈的冷却。最后，蓝铜矿中存在主导的二聚体相互作用表明，对于有效的低能描述，应该使用有效的哈密顿量，我们提出这种方法可能对充分考虑三维耦合几何形状有用。
