Condensed Matter Theory Center and Joint Quantum Institute, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA.
Phys Rev Lett. 2011 Oct 21;107(17):177006. doi: 10.1103/PhysRevLett.107.177006. Epub 2011 Oct 20.
We study the diamagnetism of the six-vertex model with the arrows as directed bond currents. To our knowledge, this is the first study of the diamagnetism of this model. A special version of this model, called the F model, describes the thermal disordering transition of an orbital antiferromagnet, known as d-density wave, a proposed state for the pseudogap phase of the high-T(c) cuprates. We find that the F model is strongly diamagnetic and the susceptibility may diverge in the high-temperature critical phase with power-law arrow correlations. These results may explain the surprising recent observation of a diverging low-field diamagnetic susceptibility seen in some optimally doped cuprates within the d-density wave model of the pseudogap phase.
我们研究了带有箭头的定向键电流的六顶点模型的抗磁性。据我们所知，这是对该模型抗磁性的首次研究。这个模型的一个特殊版本，称为 F 模型，描述了轨道反铁磁体的热无序相变，即所谓的 d-密度波，这是高温超导 cuprates 中赝能隙相的一种提出的状态。我们发现 F 模型是强抗磁性的，在高温临界相中，随着箭头相关性呈幂律发散，磁化率可能发散。这些结果可能解释了最近在一些最优掺杂的 cuprates 中观察到的令人惊讶的低场抗磁性磁化率的发散现象，这一现象可以用赝能隙相的 d-密度波模型来解释。
