Evolution of superconductivity of KxC60 upon K-doping : microwave low-field signal and ESR study

We have systematically studied a new Na-doped C60 superconductor prepared from sodium azide (NaN3). The volume fraction of superconducting phase in the best sample was 38%. We present the experimental results of the low-field signal (LFS) of microwave absorption, magnetization, and ESR. The superconducting phase seems to have a f.c.c. lattice with a = 14.33 A . Several parameters which characterize the superconductivity of this compound were estimated from LFS and magnetic experiment.

Pulat K. Khabibullaev

Papers

Low temperature microwave response of YBaCuO superconductors: narrow resonance-like peak in ESR