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A theoretical study of magnetic field (h) effects on single-particle spectraand transport quantities of heavy fermion metals in the paramagnetic phase iscarried out. We have employed a non-perturbative local moment approach (LMA) tothe asymmetric periodic Anderson model within the dynamical mean fieldframework. The lattice coherence scale $\om_L$, which is proportional withinthe LMA to the spin-flip energy scale, and has been shown in earlier studies tobe the energy scale at which crossover to single impurity physicsoccurs,increases monotonically with increasing magnetic field. The many bodyKondo resonance in the density of states at the Fermi level splits into twowith the splitting being proportional to the field itself. For h$\geq$ 0, wedemonstrate adiabatic continuity from the strongly interacting case to acorresponding non-interacting limit, thus establishing Fermi liquid behaviourfor heavy fermion metals in the presence of magnetic field. In the Kondolattice regime, the theoretically computed magnetoresistance is found to benegative in the entire temperature range. We argue that such a result could beunderstood at $T\gtrsim \om_L$ by field-induced suppression of spin-flipscattering and at $T\lesssim \om_L$ through lattice coherence. The coherencepeak in the heavy fermion resistivity diminishes and moves to highertemperatures with increasing field. Direct comparison of the theoreticalresults to the field dependent resistivity measurements in CeB$_6$ yields goodagreement.

Magnetoresistance in paramagnetic heavy fermion metals