Pressure and magnetic field tuned quantum critical point in the Kondo antiferromagnet CePtZn

We report magnetization, heat capacity and electrical resistivity measurements on CePtZn, which crystallizes in the orthorhombic TiNiSi type structure. Magnetization and electrical resistivity on the iso-structural series of compounds Ce_1-xLa_xPtZn (x = 0.1, 0.2 0.5 and 1) were also carried out. The electrical resistivity of CePtZn was also measured in external magnetic fields up to 12T and under pressures up to 2.66GPa. We find that CePtZn is a dense Kondo lattice, ordering antiferromagnetically at T _N = 1.7K, with a comparable Kondo temperature. The magnetic transition temperature, T_N, is continuously suppressed both by the magnetic field and pressure and around 5-6T and at 1.2GPa, respectively. Non-Fermi liquid behavior of resistivity at 4T and 1.2GPa and logarithmic divergence of the heat capacity, C_4f/T, at 6T in a limited temperature region strongly suggest the emergence of a quantum critical point as .