Degeneracy and Criticality from Emergent Frustration in Artificial Spin Ice
Degeneracy and Criticality from Emergent Frustration in Artificial Spin Ice
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DOI：
10.1103/physrevlett.111.177201
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发表时间：
2013-10-22
影响因子：
8.6
通讯作者：
Nisoli, Cristiano
中科院分区：
文献类型：
--
作者：
Chern, Gia-Wei;Morrison, Muir J.;Nisoli, Cristiano
尽管最初是为了模拟自旋冰烧绿石而引入的，但目前还没有人造自旋冰表现出预期的简并冰相，其关键相关性类似于烧绿石晶格中著名的库仑相。在这里，我们研究了一种基于顶点受挫几何而不是成对受挫几何的新型人造自旋冰，并表明它表现出广泛残余熵的准临界冰相，并且显着地具有代数相关性。有趣的是，我们的晶格本身是对顶点系统中挫败感的一种新颖实现，它开辟了研究关键流形中的缺陷和设计人工磁性纳米阵列中的简并性的新途径，这是一项迄今为止难以实现的任务。
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.