Resonant behaviour of the barrier of YBa2Cu3O7 grain boundary Josephson junctions fabricated on bicrystalline substrates with different geometries

Navacerrada Saturio, María de los Ángeles and Lucía Mulas, María Luisa and Sánchez Quesada, Francisco (2012). Resonant behaviour of the barrier of YBa2Cu3O7 grain boundary Josephson junctions fabricated on bicrystalline substrates with different geometries. "Physica C : Superconductivity and its applications", v. 483 (n. null); pp. 195-200. ISSN 0921-4534.

Description

Title: Resonant behaviour of the barrier of YBa2Cu3O7 grain boundary Josephson junctions fabricated on bicrystalline substrates with different geometries
Author/s:
  • Navacerrada Saturio, María de los Ángeles
  • Lucía Mulas, María Luisa
  • Sánchez Quesada, Francisco
Item Type: Article
Título de Revista/Publicación: Physica C : Superconductivity and its applications
Date: December 2012
ISSN: 0921-4534
Volume: 483
Subjects:
Freetext Keywords: Proximity effects; Weak links; Tunneling phenomena; Josephson effects
Faculty: E.T.S. Arquitectura (UPM)
Department: Física e Instalaciones Aplicadas a la Edificación, al Medio Ambiente y al Urbanismo [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

We have analyzed a resonant behavior in the dielectric constant associated to the barrier of YBa2Cu3O7 (YBCO) grain boundary Josephson junctions (GBJJs) fabricated on a wide variety of bicrystalline substrates: 12° [0 0 1] tilt asymmetric, 24° [0 0 1] tilt asymmetric, 24° [0 0 1] tilt symmetric, 24° [1 0 0] tilt asymmetric, 45° [1 0 0] tilt asymmetric and 24° [0 0 1] tilt symmetric +45° [1 0 0] tilt asymmetric bicrystals. The resonance analysis allows us to estimate a more appropriate value of the relative dielectric constant, and so a more adequate value for the length L of the normal N region assuming a SNINS model for the barrier. In this work, the L dependence on the critical current density Jc has been investigated. This analysis makes possible a single representation for all the substrate geometries independently on around which axes the rotation is produced to generate the grain boundary. On the other hand, no clear evidences exist on the origin of the resonance. The resonance frequency is in the order of 1011 Hz, pointing to a phonon dynamic influence on the resonance mechanism. Besides, its position is affected by the oxygen content of the barrier: a shift at low frequencies is observed when the misorientation angle increases.

More information

Item ID: 16167
DC Identifier: http://oa.upm.es/16167/
OAI Identifier: oai:oa.upm.es:16167
Official URL: http://www.journals.elsevier.com/physica-c-superconductivity-and-its-applications/
Deposited by: Memoria Investigacion
Deposited on: 02 Oct 2013 18:54
Last Modified: 02 Apr 2020 10:38
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