高约束经典自旋系统中的临界现象：库仑相的Neel序
Critical phenomena in a highly constrained classical spin system: Neel ordering from the Coulomb phase
摘要：
许多经典的几何阻挫反铁磁体具有宏观简并的基态。在一类三维系统中，简并基态的集合具有幂律相关性，并且是库仑相的一个例子。我们调查尼尔订购从这样的库仑相，诱导弱的额外的相互作用，解除简并。我们表明，临界点属于一个普遍性的类，这是从一个不同的等效过渡出的顺磁相，它的特点是有效的长程相互作用，或者，订购可能是不连续的。我们认为，这种类型的过渡可以通过施加单轴应力烧绿石反铁磁体实现。
英文摘要：
Many classical, geometrically frustrated antiferromagnets have macroscopically degenerate ground states. In a class of three-dimensional systems, the set of degenerate ground states has power-law correlations and is an example of a Coulomb phase. We investigate Neel ordering from such a Coulomb phase, induced by weak additional interactions that lift the degeneracy. We show that the critical point belongs to a universality class that is different from the one for the equivalent transition out of the paramagnetic phase, and that it is characterised by effective long-range interactions; alternatively, ordering may be discontinuous. We suggest that a transition of this type may be realised by applying uniaxial stress to a pyrochlore antiferromagnet.
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