Degeneracy and criticality from emergent frustration in artificial spin ice.
暂无分享,去创建一个
Although initially introduced to mimic the spin-ice pyrochlores, no artificial spin ice has yet exhibited the expected degenerate ice phase with critical correlations similar to the celebrated Coulomb phase in the pyrochlore lattice. Here we study a novel artificial spin ice based on a vertex-frustrated rather than pairwise frustrated geometry and show that it exhibits a quasicritical ice phase of extensive residual entropy and, significantly, algebraic correlations. Interesting in its own regard as a novel realization of frustration in a vertex system, our lattice opens new pathways to study defects in a critical manifold and to design degeneracy in artificial magnetic nanoarrays, a task so far elusive.
[1] V. F. Petrenko,et al. Physics of Ice , 1999 .
[2] R. Baxter,et al. The inversion relation method for some two-dimensional exactly solved models in lattice statistics , 1982 .