Robust superconductivity against the antiferromagnetic ordering in Pr2Pt3Ge5

Abstract

The polycrystalline sample of Pr2Pt3Ge5 have been prepared successfully. The temperature and magnetic field dependence of resistivity as well as heat capacity has been carried out. The resistivity reveals the robustness of superconductivity against intrinsic antiferromagnetic ordering in the system. The onset of superconducting phase transition, TCon ≈ 6.7 K and the two antiferromagnetic transitions at TN1 ≈ 3.5 K and TN2 ≈ 4.3 K are almost similar to its single crystal counterpart. Important superconducting as well as normal state parameters have been estimated and discussed. Hc2(0) ≈ 2.5T as estimated using Werthamer-Helfand-Hohenberg (WHH) formalism while Hc2(0) ≈ 2.1T by using Ginzburg-Landau (GL) theory. The Hc2(0) value is quite high as compared to its single crystal counterpart. The reason could be the formation of pinning centers hitherto unknown. The broadening of resistivity curves with the increment of magnetic field has been analyzed using the thermally activated flux flow of vortices (TAFF) model whereas the zero field broadening is analyzed in terms of Aslamazov-Larkin (AL) predictions. From TAFF analysis the activation energy (U0) has been determined. The normal state magnetoresistance at different isothermal conditions doesn't obey the Kohler's rule, which reveals the possibility of an anisotropic Fermi surface and/or the multiband nature of the system. The specific heat measurement doesn't show substantiate jump at superconducting temperature similar to the single crystal counterpart. As we increase the magnetic field, the antiferromagnetic peaks get suppressed and completely vanishes around 10T.