Microbridge study of the heavy fermion superconductor U2PtC2

For U2PtC2 compound basic kinetic and thermodynamic parameters, demanstrating manifestation of heavy fermion effects in it are determined at low temperatures. U2PtC2 resistance temperature dependence on which a transition to a superconducting state at Tk=1.25 K its width making up 0.15 K is observed, is measured in detail. Investigation into non-linearity of VAC of point contacts produced between U2PtC2 and Me, where Me=Ag, Cu, W, Ta, Mo, U2PtC2 is conducted. Contact dimensions, electron path length and specific resistance in them testifying to the thermal regime of the current flow in the narrowing are evaluated. The change of VAC and its derivatives under transition of one or the both of contacting materials to superconducting state is studied. The energy gap value in U2PtC2 2Δ (0)/kTk=3.4 is evaluated and its temperature dependence ΔT at Tk/2 < T < Tk is found. It is detected that superconducting peculiarities only from one (any) materials are manifested on U2PtC2-Ta(Mo) heterocontact VAC at the temperatures lower than the ones of each of the electrodes, and the critical current is obsent as in U2PtC2 -U2PtC2 homocontacts. The reason for superconducting state strong suppression in the contacts investigated is discussed