Abstract

We discuss the reason why the magnetic ordering with small moments is realized in the heavy fermion systems. The reason is that almost full localized moments cannot be created without destroying the heavy fermion states but only small localized moments can be created within the heavy fermion states. Then, we discuss the conditions of the magnetic instability in the heavy fermion system and point out the tendency that the ordering temperature is inversely proportional to the enhanced electron mass. The critical temperature of the superconductivity is also reduced in the same way

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