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We have investigated metallic break junctions of the heavy-fermion compoundUPd2Al3 at low temperatures between 0.1K and 9K and in magnetic fields up to8T. Both the current-voltage I(V) characteristics and the dV/dI (V) spectraclearly showed the superconducting ($T_{\rm c}\simeq$ 1.8K) as well as theantiferromagnetic ($T_{\rm N}\simeq$14K) transition at low temperatures whenthe bias voltage is raised. The junctions with lateral size of order 200nm hadhuge critical current densities around $5\times 10^{10} A/m^2 at theantiferromagnetic transition and hysteretic I(V) characteristics. Degrading thequality of the contacts by in situ increasing the local residual resistivityreduced the hysteresis. We show that those hysteretic I(V) curves can bereproduced theoretically by assuming the constriction to be in the thermalregime. It turns out that these point contacts represent non-linear deviceswith N-shaped I(V) characteristics that have a negative differential resistancelike an Esaki tunnel diode.Comment: 12 pages, 7 fig

The antiferromagnetic transition of UPd2Al3break junctions: a new realization of N-shaped current–voltage characteristics

The antiferromagnetic transition of UPd₂Al₃break junctions: a new realization of N-shaped current–voltage characteristics