Magnetoresistance and growth of the coherent state in CeCu6

The magnetoresistance is studied in the heavy fermion compound CeCu6 over the temperature range in which the coherent state forms. At high temperatures it is negative and agrees with the theory for a single Kondo impurity. At low temperatures, in the coherent state, it is dominated by a linear positive magnetoresistance which is attributed to the field-induced symmetry breaking process discussed by Mahan (1983, 1984). From the growth of the linear magnetoresistance and deviations from single impurity Kondo behaviour it is concluded that formation of the coherent state is accompanied by an anisotropic reconstruction of the Fermi surface.

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