Publications by Andrea Cavalleri


Pressure tuning of light-induced superconductivity in K3C60

Nature Physics Nature Publishing Group 14 (2018) 837–841-

A Cantaluppi, M Buzzi, G Jotzu, D Nicoletti, M Mitrano, D Pontiroli, M Riccò, A Perucchi, P Di Pietro, A Cavalleri

Optical excitation at terahertz frequencies has emerged as an effective means to dynamically manipulate complex materials. In the molecular solid K 3 C 60 , short mid-infrared pulses transform the high-temperature metal into a non-equilibrium state with the optical properties of a superconductor. Here we tune this effect with hydrostatic pressure and find that the superconducting-like features gradually disappear at around 0.3 GPa. Reduction with pressure underscores the similarity with the equilibrium superconducting phase of K 3 C 60 , in which a larger electronic bandwidth induced by pressure is also detrimental for pairing. Crucially, our observation excludes alternative interpretations based on a high-mobility metallic phase. The pressure dependence also suggests that transient, incipient superconductivity occurs far above the 150 K hypothesized previously, and rather extends all the way to room temperature.


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