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

Anno: 2013

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

Affiliazione autori: CNR, Ist Cibernet E Caianiello, I-80078 Naples, Italy; CNR, SPIN, I-80126 Naples, Italy; CNR, Ist Nazl Ott, I-80078 Naples, Italy; Ist Nazl Fis Nucl, Sez Napoli, I-80126 Naples, Italy; CNR, Ist Foton & Nanotecnol, I-00156 Rome, 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.

Giornale/Rivista: SUPERCONDUCTOR SCIENCE & TECHNOLOGY

Volume: 26 (10)      Da Pagina: 105013-1  A: 105013-6

Maggiori informazioni: 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.
Parole chiavi: High-temperature Superconductors; Josephson Current; State; Spectroscopy; Dependence
DOI: 10.1088/0953-2048/26/10/105013

Citazioni: 5
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-18
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