Freezing and thawing of artificial ice by thermal switching of geometric frustration in magnetic flux lattices.
Freezing and thawing of artificial ice by thermal switching of geometric frustration in magnetic flux lattices.
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DOI：
10.1038/nnano.2014.158
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发表时间：
2013-07
影响因子：
38.3
通讯作者：
J. Trastoy;Maxime Malnou;C. Ulysse;Rozenn Bernard;N. Bergeal;G. Faini;J. Lesueur;J. Briatico;J. Villegas
中科院分区：
文献类型：
--
作者：
J. Trastoy;Maxime Malnou;C. Ulysse;Rozenn Bernard;N. Bergeal;G. Faini;J. Lesueur;J. Briatico;J. Villegas
势能景观上的排斥粒子系综问题在许多物理系统中很常见，并且已经在多个人工操场上进行了研究。然而，后者通常涉及固定的能量景观，从而阻碍在situinvestigations的粒子的集体响应的景观几何形状的控制变化。在这里，我们通过实验实现了一个系统，在该系统中，可以使用温度作为控制旋钮来切换势能景观的几何形状。这种实现是基于一个高温超导体，我们工程师的超导冷凝物的纳米空间调制。根据温度的不同，由外加磁场诱导的通量量子要么看到有利于冰状通量排序的几何受抑能量景观，要么看到产生周期性通量分布的未受抑景观。这种效应反映在超导体的磁输运的巨大变化中。能量景观几何的热切换为研究排斥粒子流形中的有序和重组提供了新的机会。
The problem of an ensemble of repulsive particles on a potential-energy landscape is common to many physical systems and has been studied in multiple artificial playgrounds. However, the latter usually involve fixed energy landscapes, thereby impedingin situinvestigations of the particles’ collective response to controlled changes in the landscape geometry. Here, we experimentally realize a system in which the geometry of the potential-energy landscape can be switched using temperature as the control knob. This realization is based on a high-temperature superconductor in which we engineer a nanoscale spatial modulation of the superconducting condensate. Depending on the temperature, the flux quanta induced by an applied magnetic field see either a geometrically frustrated energy landscape that favours an ice-like flux ordering, or an unfrustrated landscape that yields a periodic flux distribution. This effect is reflected in a dramatic change in the superconductor's magneto-transport. The thermal switching of the energy landscape geometry opens new opportunities for the study of ordering and reorganization in repulsive particle manifolds.