Phase transitions in few-monolayer spin ice films
Phase transitions in few-monolayer spin ice films
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DOI：
10.1038/s41467-019-09187-w
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发表时间：
2019-03-14
影响因子：
16.6
通讯作者：
Bramwell, S. T.
中科院分区：
文献类型：
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作者：
Bovo, L.;Rouleau, C. M.;Bramwell, S. T.
顶点模型是一类重要的统计力学系统，它具有精确解和奇异物理。应用包括水冰，铁电和反铁电，自旋冰和人工自旋冰。在这里，我们表明，它是可能的工程自旋冰膜原子层精度下降到单层极限。比热测量表明，这些电影，这有一个根本不同的对称散装自旋冰，实现系统接近的二维F-模型，具有异国情调的相变topologicallyconstrained配置流形。我们的研究结果表明，如何自旋冰薄膜可以释放著名的鲍林熵自旋冰没有异常的比热。他们还显着扩大了可用于实验的顶点模型的类别。
Vertex models are an important class of statistical mechanical system that admit exact solutions and exotic physics. Applications include water ice, ferro- and antiferro-electrics, spin ice and artificial spin ice. Here we show that it is possible to engineer spin ice films with atomic-layer precision down to the monolayer limit. Specific heat measurements show that these films, which have a fundamentally different symmetry to bulk spin ice, realise systems close to the two-dimensional F-model, with exotic phase transitions on topologicallyconstrained configurational manifolds. Our results show how spin ice thin films can release the celebrated Pauling entropy of spin ice without an anomaly in the specific heat. They also significantly expand the class of vertex models available to experiment.