Magnetic Field Dependence of the Electrical Resistivity in Non-Fermi Liquid U0.05Y0.95Al2, U0.2Y0.8Pd3 and UCu5-xPdx (x=1.0,0.9)

A.M. Strydom and P. de V. Du Plessis f-Electron Magnetism and Heavy-Fermion Physics Research Programme Physics Department, University of the Witwatersrand Private Bag 3, PO WITS 2050, Johannesburg, South Africa

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We investigate the influence of applied magnetic fields up to B=8T on the electrical resistivity attemperatures down to 1.5K for three established non-Fermi liquid systems U0.05Y0.95Al2, U0.2Y0.8Pd3 and UCu5-xPdx (x=1.0,0.9). We follow the approach that an unconventional Kondo mechanism is often seen to be operative at low temperatures in some non-Fermi liquid systems where there are logarithmic or power-law divergences in the temperature dependences of magnetic susceptibility, the specific heat, and the electrical resistivity. In the above systems the incoherent Kondo scattering dominates the electrical resistivity ρ(T) at higher temperatures, while at low temperatures ρ~Tn with n≈1, instead of n=2 as expected for a Fermi-liquid. We show how the power-law dependence is affected by a magnetic field. The isothermal magnetoresistivity as a function of field is analysed in terms of the Bethe ansatz description in order to extract values of the characteristic Kondo temperature TK.

DOI: 10.12693/APhysPolA.98.593 PACS numbers: 71.27.+a, 72.15.Qm, 72.15.Gd