Abstract
The existence of two temperatures: T p-Cooper pairing and T c-Bose–Einstein condensation in high temperature superconductors has been stipulated in a lightly potassium-doped C 60 by Magnetically Modulated Microwave Absorption. This doping level corresponds to the carrier density greater than the critical one: x> x 1. In case of rubidium lightly doped C 60, where the carrier density x was smaller than the critical one: x< x 1, anomalous EPR temperature dependence was observed. The characteristic temperature of bound electron pair formation T p≈65 K and the energy gap 2 Δ/ k=30 K were estimated from the temperature dependence of the EPR signal intensity in non-superconducting state. These results suggest that the liquid fermions–liquid bosons transition can be observed as the opening of the spin gap at temperature T p postulated in Micnas–Ranninger–Robaszkiewicz theory.
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