Abstract
We have studied a change of the Fermi surface in an antiferromagnet CeIn 3 via the de Haas–van Alphen experiment under pressure up to 2.9 GPa. In the pressure region P > P c = 2.6 GPa, we have observed a large main Fermi surface named a , which indicates that the electronic state of 4 f electron in CeIn 3 changes from localized to itinerant at P c . The cyclotron effective mass m c * of this main Fermi surface is extremely enhanced around P c .
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