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What state of matter this is remains unknown.","posed_since":"2016","precise":"$\\mathrm{K_3C_{60}}$ (equilibrium $T_{\\mathrm{c}} = 20\\,\\mathrm{K}$) excited at mid-infrared or terahertz frequencies shows a transient gap in $\\sigma_1(\\omega)$ and $\\sigma_2(\\omega) \\sim 1/\\omega$ well above $T_{\\mathrm{c}}$, with metastable states lasting nanoseconds at high fluence. Identify the state (transient superconductor, fluctuating pairs, high-mobility normal state, or analysis artifact) and its microscopic mechanism. Answer: a mechanism consistent with optical, transport and magnetic data.","problem_ref":"1ded679c5ad8b8ea375c402469b19aa10eda14eeafcea7513745efd2fc8cc18d","references":"","settled_by":"Transient magnetic, zero-resistance and optical measurements on the same samples, explained by one microscopic model.","status_note":"Dodge, Lopez and Sahota (arXiv:2307.00204, 2023) argue the optical evidence comes from an analysis flaw and reflects photoenhanced carrier mobility; a 2025 field-expulsion search (De Vecchi et al., arXiv:2502.20276) set only an upper limit.","title":"What is the photoexcited state of $\\mathrm{K_3C_{60}}$ above 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