A wet-chemical
method is used to synthesize rubidium-doped C60 samples.
Superconductivity with a critical temperature of
22–23 K is identified from the magnetization and resistivity
measurements based on the Meissner effect and the zero-resistivity
state. Raman scattering measurements show a downshift of 16 ±
1 cm–1 for the A
g
(2) vibrational mode, yielding a charge transfer of less than
3, which puts the new superconductor in the face-centered cubic structure
based on the well-established phase diagram for this system. The superconducting
parameters, such as the critical current density, the lower and upper
critical field, and the derived coherence length and penetration depth,
are determined from multiple techniques for this superconductor.
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