RVB superconductors and tunnel junctions

Karsten Flensberg; Per Hedegård

doi:10.1016/0921-4534(89)90457-7

RVB superconductors and tunnel junctions

Karsten Flensberg^*, Per Hedegård

^*Corresponding author af dette arbejde

Faststoffysik

3 Citationer (Scopus)

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.

Originalsprog	Engelsk
Tidsskrift	Physica C: Superconductivity and its Applications
Vol/bind	160
Udgave nummer	1
Sider (fra-til)	89-101
Antal sider	13
ISSN	0921-4534
DOI	https://doi.org/10.1016/0921-4534(89)90457-7
Status	Udgivet - 15 aug. 1989

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RVB superconductors and tunnel junctions

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