Bulk and local magnetic susceptibility in CeAl2 and CeB6

Abstract A comprehensive and high-precision magnetoresistance (MR) Δ ρ / ρ ( H , T ) and magnetization M(H,T) measurements have been carried out for two well known and archetypal magnetic strongly correlated electron systems—CeAl2 and CeB6. It was shown that the main Brillouin-type component of MR in these magnetic heavy fermion compounds can be consistently interpreted in the frameworks of a simple relation between resistivity and magnetization— Δ ρ / ρ ∼ M 2 obtained by Yosida [Phys. Rev. 107 (1957) 396]. A local magnetic susceptibility χ loc ( T , H ) = ( 1 / H * ( d ( Δ ρ / ρ ) / d H ) ) 1 / 2 was deduced directly from this part of MR and compared in details with the data of bulk susceptibility χ(T,H) measurements. Two additional contributions to MR have been also deduced for CeAl2 ((i) linear (∼H) and (ii) nanoscale ferromagnetic components) and applied for a characterization of spin polarons in this magnetic material. The dependencies χloc(T,H) and χ(T,H) obtained in this study for CeB6 and CeAl2 allow us to analyze the H–T magnetic phase diagram in these magnetic heavy fermion compounds.