Theory of tunneling conductance for normal metal/insulator/triplet superconductor junctions

Abstract

Tunneling conductance spectra of normal metal/insulator/triplet superconductor junctions are investigated theoretically. As triplet paring states we select several types of symmetries that are promising candidates for the superconducting states in UPt${}_3$ and in Sr${}_2$RuO${}_4$. The calculated conductance spectra are sensitive to the orientation of the junction which reflects the anisotropy of the pairing states. They show either 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 results serve as a guidefor the experimental determination of the symmetry of the pair potentials in UPt${}_3$ and Sr${}_2$RuO${}_4$.

10 pages, 11 eps figures, J.Phys.Soc.Jpn.67,No.9(1998)

References in corpus (4)

• Ferromagnetic spin fluctuation induced superconductivity in Sr_2RuO_4
• Theory of tunneling spectroscopy in superconducting Sr2RuO4
• Quasiparticle Bound States and Low-Temperature Peaks of the Conductance of NIS Junctions in d-Wave Superconductors
• Thermal Conductivity and Gap Structure of the Superconducting Phases of UPt3

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