Amplitude sensitive experiment of pairing symmetry in d(0)-d(0) submicron Y-Ba-Cu-O bicrystal grain boundary junctions

Year: 2013

Authors: Sarnelli E., Adamo M., De Nicola S., Cibella S., Leoni R., Nappi C.

Autors Affiliation: CNR Istituto di Cibernetica \’E Caianiello\’, Via Campi Flegrei 34, I-80078, Pozzuoli, Napoli, Italy; CNR-SPIN, Monte S Angelo, Via Cinthia, I-80126 Napoli, Italy; CNR, Istituto Nazionale di Ottica, Via Campi Flegrei 34, I-80078, Pozzuoli, Napoli, Italy; INFN Sezione di Napoli, Complesso Universitario di Monte S Angelo, Via Cinthia, I-80126 Napoli, Italy; CNR Istituto di Fotonica e Nanotecnologie, I-00156 Roma, Italy

Abstract: We have fabricated and analyzed submicron YBa2Cu3O7-x grain boundary Josephson junctions grown on [100] tilt SrTiO3 bicrystal substrates. We present an experiment sensitive to the amplitude of the order parameter. To this aim, we have measured electrical properties of [100] tilt bicrystal YBa2Cu3O7-x grain boundary junctions with nominal widths of 700 nm and 300 nm. Junctions are fabricated so that positive lobes of the d-wave electrodes face one another (d(0)-d(0) junction). We demonstrate that, in such devices, the temperature dependences of the critical current may be accounted for by very high-transparency junction barriers, in which the influence of nodes in the pair potential is an essential element. We based our analysis on a recent theoretical model that, starting from the Bogoliubov-de Gennes equations, takes into account the presence of Andreev bound states in layered superconductors, with Cu-O planes tilted with respect the substrate plane, as is the case of [100] tilt grain boundary junctions.


Volume: 26 (10)      Pages from: 105013  to: 105013

More Information: The authors wish to thank Dr G Gentile for supplying SEM images. The financial contribution of EU NMP.2011.2.2-6 IRONSEA project no. 283141 is gratefully acknowledged.
DOI: 10.1088/0953-2048/26/10/105013

Citations: 4
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