Modulated magnetism in PrPtAl
Modulated magnetism in PrPtAl
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DOI：
10.1038/nphys3238
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发表时间：
2015-04-01
期刊：
影响因子：
19.6
通讯作者：
Huxley, Andrew D.
中科院分区：
文献类型：
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作者：
Abdul-Jabbar, Gino;Sokolov, Dmitry A.;Huxley, Andrew D.
顺磁性和铁磁性之间的转变是有限温度下连续相变的范例。当这种转变在清洁材料中被调谐到零温度时，低能零点波动的增长可能会驱动一系列现象，包括形成新的状态，如非传统超导性。然而，在实验上，随着温度的降低，涨落的增长被抑制，跃迁变得不连续。这被理解为产生于总是发生的对自由能的非分析修正（1）。在最近的理论（2，3）中，激发光谱的变化与基态一起被自洽地考虑。这一分析表明，过渡到一个新的状态可能是一个替代的结果。由于激发光谱（“无序”）是促进新“有序”的关键，这种机制被称为“无序有序”。在这里，我们报告的调制顺序PrPtAl的发现，符合复杂的螺旋，在顺磁性和铁磁性之间的边界，给出了第一个明确的实验实现这样的状态。
The transition between paramagnetism and ferromagnetism is the paradigm for a continuous phase transition at finite temperature. When such a transition is tuned to zero temperature in clean materials, the growth of low-energy zero-point fluctuations potentially drives an array of phenomena, including the formation of novel states such as non-conventional superconductivity. Experimentally, the growth of the fluctuations, however, is curtailed and the transition becomes discontinuous as its temperature is reduced. This is understood to arise from non-analytic corrections to the free energy that always occur(1). In a recent theory(2,3), changes of the excitation spectrum are self-consistently considered alongside the ground state. This analysis reveals that a transition to a new state may be an alternative outcome. As the excitation spectrum (the 'disorder') is pivotal to promoting the new 'order' this mechanism is referred to as 'order by disorder'. Here, we report the discovery of modulated order in PrPtAl, consistent with complex spirals, at the boundary between paramagnetism and ferromagnetism, giving the first clear experimental realization of such a state.