Magnetoresistance and magnetization anomalies in CeB 6

Abstract

High precision magnetoresistance (MR) Δ ρ/ρ( H, T) and magnetization M( H, T) measurements have been carried out for well known and typical strongly correlated electron system—cerium hexaboride. The detailed measurements have been fulfilled on single crystalline samples of CeB 6 over a wide temperature range T ⩾ 1.8 K in magnetic fields up to 70 kOe. It was shown that the MR anomalies in the magnetic heavy fermion compound under investigation 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 the MR Δ ρ( H, T) measurements and compared with the experimental data of magnetization M( H, T). The magnetic susceptibility dependences χ loc( T, H) and χ( T, H) obtained in this study for CeB 6 allow us to analyze the complicated H– T magnetic phase diagram of this so-called dense Kondo-system.