Abstract
Low temperature specific heat studies on contamination free single crystals of PrBa2Cu3O7−δ (PBCO) are reported in the temperature range 1.6–40K and in applied magnetic fields ofH=0T, 2T, 5T and 7.5T. The measurements have been performed with the applied magnetic, fields parallel and perpendicular to thec-axis. The high quality of the PBCO crystals grown in BaZrO3 crucible is reflected in the observed sharp antiferromagnetic ordering peak atT N=16.6K. The shift ofT N with magnetic field is found to follow aH 2-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.
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