Low-Temperature Properties of the Dense Kondo System Ce_0.5La_0.5B₆

Abstract

Low-temperature specific heat and electric resistivity of the dense Kondo compound Ce_0.5La_0.5B₆ have been measured. The specific heat for H=0 shows a broad peak at around 0.9, K corresponding to the Kondo effect. No indication of magnetic or quadrupolar phase transition is observed down to 100, mK for H=0. Very large specific heat coefficients of γ =1.8, J/K², mol and β =2.9, J/K⁴, mol for H=0 indicate the Kondo singlet ground state without long-range ordering.