Full set of superconducting parameters of K<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si50.svg" display="inline" id="d1e1080"><mml:msub><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:math>C60

The superconducting parameters are the key for building or identifying theory responsible mechanism of superconductivity. Such fulleride superconductors have not been well established despite tremendous efforts over past 30 years. Here we provide a full set through systematic study on well-characterized K3C60 sample. obtained high upper critical field 33.0 ± 0.5 T from direct electrical transport measurements together with relatively temperature and large current density classifies as promising three-dimensional magnet material advantage rich carbon abundance Earth. evaluation all self-consistently suggests unconventional nature superconductivity joint contributions electron–phonon coupling electron correlations. These results findings important only fundamentally understanding in fullerides but also future developments applications.