Possible light-induced superconductivity in K3C60 at high temperature.
Possible light-induced superconductivity in K3C60 at high temperature.
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DOI：
10.1038/nature16522
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发表时间：
2016-02-25
期刊：
影响因子：
64.8
通讯作者：
Cavalleri A
中科院分区：
文献类型：
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作者：
Mitrano M;Cantaluppi A;Nicoletti D;Kaiser S;Perucchi A;Lupi S;Di Pietro P;Pontiroli D;Riccò M;Clark SR;Jaksch D;Cavalleri A
固体中涌现现象的非平衡控制是一个重要的研究前沿，包括超导的光学增强等效应。近年来，在远高于Tc的温度下，双层铜酸盐中某些声子的非线性激发被证明能诱导出类似超导的光学性质。这种效应伴随着电荷-密度波相互关系的破坏，这解释了部分但不是全部的实验结果。在这里，我们在一个非常不同的化合物中报告了类似的现象。通过中红外光脉冲激发金属K3C60，我们诱导载流子迁移率大幅增加，同时光学导电性出现了一个缺口。引人注目的是，当金属K3C60冷却到低于超导转变温度（Tc = 20k）时，这些相同的特征也被观察到。虽然光技术本身不能明确地识别非平衡高温超导性，但我们提出这种情况作为我们结果的可能解释。
The non-equilibrium control of emergent phenomena in solids is an important research frontier, encompassing effects like the optical enhancement of superconductivity . Recently, nonlinear excitation , of certain phonons in bilayer cuprates was shown to induce superconducting-like optical properties at temperatures far above Tc . This effect was accompanied by the disruption of competing charge-density-wave correlations, which explained some but not all of the experimental results. Here, we report a similar phenomenon in a very different compound. By exciting metallic K3C60 with mid-infrared optical pulses, we induce a large increase in carrier mobility, accompanied by the opening of a gap in the optical conductivity. Strikingly, these same signatures are observed at equilibrium when cooling metallic K3C60 below the superconducting transition temperature (Tc = 20 K). Although optical techniques alone cannot unequivocally identify non-equilibrium high-temperature superconductivity, we propose this scenario as a possible explanation of our results.