RVB superconductors and tunnel junctions

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We discuss the consequences of an RVB state modelled with independent charge and spin carriers (holons and spinons, respectively), focusing on the superconducting state. The current-voltage characteristic for a tunnel junction with RVB superconductors on one side of the junction is calculated. We consider different contributions to the current through the junction: quasiparticle current, Andreev current, and Josephson current. We show that the extra degrees of freedom present in the RVB state explain the non-linear quasiparticle characteristics and the low relative Andreev signal. However, in the low voltage regime the independent holon and spinon picture leads to results contradictory to the experimental data: the BCS-like structures which are seen experimentally in the spectra are absent.

Original languageEnglish
JournalPhysica C: Superconductivity and its Applications
Issue number1
Pages (from-to)89-101
Number of pages13
Publication statusPublished - 15 Aug 1989

ID: 199596365