Does photoexcited $\mathrm{K_3C_{60}}$ above $T_{c}$ expel magnetic field?
This text mentions work from 2024 on. Those parts were partly written without a live literature search and have not been checked by an editor yet.
In plain words
Superconductors push out magnetic fields (the Meissner effect). A measurement on light-driven $\mathrm{K_3C_{60}}$ has so far only set a limit on this effect.
Precise statement
Measure the transient volume susceptibility $\chi_v$ of $\mathrm{K_3C_{60}}$ at $T > 20\ \mathrm{K}$ after mid-infrared excitation; complete expulsion is $\chi_v = -1/(4\pi)$ in CGS, reduced by the excited volume fraction. Answer yes or no: is $\chi_v(t, T)$ distinguishable from zero within its uncertainty and consistent with superconducting diamagnetism of the excited volume?
What would settle it
Time-resolved magneto-optic or nitrogen-vacancy magnetometry on single crystals or dense films with better field resolution than the 2025 powder measurement.
Status in the literature
Unverified note: it names recent work and was partly written without a live literature search; it awaits a check by an editor.
A 2025 Faraday-rotation search on powders (De Vecchi et al., arXiv:2502.20276) bounded the response to less than about 10 percent of complete expulsion, which does not decide the question.
Parent problems
- Special case of What is the photoexcited state of $\mathrm{K_3C_{60}}$ above $T_{\mathrm{c}}$? · open · from revision 1 The parent was revised since revision 1: it now states another question.
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