Very Low Temperature Tunnelling Spectroscopy in the heavy fermion superconductor PrOs${}_4$Sb${}_{12}$

Abstract

We present scanning tunnelling spectroscopy measurements on the heavy fermion superconductor PrOs${}_4$Sb${}_{12}$. Our results show that the superconducting gap opens over a large part of the Fermi surface. The deviations from isotropic BCS s-wave behavior are discussed in terms of a finite distribution of values of the superconducting gap.

4 pages, 4 figures