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Heavy Fermion Behaviors of Amorphous Ce_9Cu_<91> Alloy in High Magnetic Fields(Transport and Fermiology)

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Heavy fermion behaviors observed in the amorphous(a-) Ce_9Cu_<91> alloy are markedly suppressed by applying high magnetic fields, H. The electronic specific heat coefficient, which is extremely large at H=0 Oe becomes smaller for H>100 kOe. With increasing H, the magnetization curve increases nonlinearly, where the magnetic susceptibility estimated for H>100 kOe is one order smaller than that for H<10 kOe. At 4.2 K, the magnetoresistance is negative and its absolute value is very small owing to the disorder scattering. These features indicate that a dense Kondo behavior is strongly suppressed in a high magnetic field.

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