Abstract
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 language | English |
|---|---|
| Journal | Physica C: Superconductivity and its Applications |
| Volume | 160 |
| Issue number | 1 |
| Pages (from-to) | 89-101 |
| Number of pages | 13 |
| ISSN | 0921-4534 |
| DOIs | |
| Publication status | Published - 15 Aug 1989 |