Point contact measurements of URu₂Si₂

Abstract

We present point-contact measurements of the antiferromagnetic heavy-fermion superconductor URu2Si2. An analysis of the jump height and the power law dependence of the specific heat suggest a superconducting gap function with a line of nodes. In point contact measurements a 'gap' in the conductance develops in the normal state as the temperature is lowered below the Néel temperature. Our data in the superconducting state agree remarkably well with the theory of Blonder, Tinkham and Klapwijk (BTK), and are also consistent with a gap with non-s-wave symmetry. © 1993.