Magnetic Properties of Superconducting Rb3C60
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Magnetic susceptibility, magnetization curves and flux creep of superconducting Rb3C60 with Tc?=?27.5 K have been studied. The critical current for Rb3C60 was evaluated to be 4???106 A/cm2 at 7 K and 10 kOe, which is considerably higher than for K3C60. The flux creep measurements give the activation energy of U(7 K) ? 3.3???10-2 eV.
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[2] A. Kortan,et al. Superconductivity at 28 K in RbxC60. , 1991, Physical review letters.