Journal
NATURE
Volume 530, Issue 7591, Pages 461-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nature16522
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Funding
- European Research Council under the European Union [319286]
- Deutsche Forschungsgemeinschaft via the excellence cluster 'The Hamburg Centre for Ultrafast Imaging - Structure, Dynamics and Control of Matter at the Atomic Scale' [SFB925]
- Swiss National Supercomputing Center (CSCS) [s497]
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The non-equilibrium control of emergent phenomena in solids is an important research frontier, encompassing effects such as the optical enhancement of superconductivity(1). Nonlinear excitation(2,3) of certain phonons in bilayer copper oxides was recently shown to induce superconducting-like optical properties at temperatures far greater than the superconducting transition temperature, T-c (refs 4-6). This effect was accompanied by the disruption of competing charge-density-wave correlations(7,8), which explained some but not all of the experimental results. Here we report a similar phenomenon in a very different compound, K3C60. 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. These same signatures are observed at equilibrium when cooling metallic K3C60 below T-c (20 kelvin). Although optical techniques alone cannot unequivocally identify non-equilibrium high-temperature superconductivity, we propose this as a possible explanation of our results.
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