Specific Heat of Single Crystalline PrBa<inf>2</inf>Cu<inf>3</inf>O<inf>7-δ</inf> in magnetic fields

Low temperature specific heat studies on contamination free single crystals of PrBa2Ou3O7-δ (PBCO) are reported in the temperature range 1.6-40K and in applied magnetic fields of H= 0T, 2T, 5T and 7.5T. The measurements have been performed with the applied magnetic fields parallel and perpendicular to the c-axis. The high quality of the PBCO crystals grown in BaZrO3 crucible is reflected in the observed sharp antiferromagnetic ordering peak at TN = 16.6K. The shift of TN with magnetic field is found to follow a H2-dependence. The observed antiferromagnetic ordering of the Pr3+ ion is discussed in the framework of 3D ordering and compared with the previous reports on polycrystalline samples.