Abstract
Superconductivity (SC) in K-doped molecular alloys of C 60 and C 70 are studied by means of the nonresonant microwave low-field signal (LFS) and conventional ESR, and a LFS-search for SC in K xC 70 is performed. The critical temperature of K x(C 60/C 70) determined at the onset of hysteretic LFS, decreases to T c=16K (at about 10% C 70), and T c=10K (at about 25% C 70), compared with T c=19K in pure K xC 60 suggesting the decrease of electron-phonon coupling. A strong multicomponent g=2 ESR signal appears and coexists with LFS at low T for SC composition of K x(C 60/C 70) indicating presence of a non-SC metallic phase. At overdoping LFS disappears and a single ESR line is enormously broadened to Δ H pp(300K) = 80G. In K xC 70 doped under the same conditions the LFS is not detected, indicating absence of SC above 5K, while a narrow ESR single line appears.
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