THEORY OF TUNNELING CONDUCTANCE FOR NORMAL METAL INSULATOR/TRIPLET SUPERCONDUCTOR JUNCTION/

Tunneling conductance spectra of normal metal/insulator/triplet superc onductor junctions are investigated theoretically. As triplet paring s tates we select several types of symmetries that are promising candida tes for the superconducting states in UPt3 and in Sr2RuO4. The calcula ted conductance spectra are sensitive to the orientation of the juncti on which reflects the anisotropy of the pairing states. They show eith er zero-bias conductance peaks or gap-like structures depending on the orientation of the junctions. The existence of a residual density of states, peculiar to nonunitary states, is shown to have a significant influence on the properties of the conductance spectra. Present result s serve as a guide for the experimental determination of the symmetry of the pair potentials in UPt3 and Sr2RuO4.