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

Navacerrada Saturio, Maria Angeles; Lucía Mulas, María Luisa y 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.

Descripción

Título: Resonant behaviour of the barrier of YBa2Cu3O7 grain boundary Josephson junctions fabricated on bicrystalline substrates with different geometries
Autor/es:
  • Navacerrada Saturio, Maria Angeles
  • Lucía Mulas, María Luisa
  • Sánchez Quesada, Francisco
Tipo de Documento: Artículo
Título de Revista/Publicación: Physica C : Superconductivity and its applications
Fecha: Diciembre 2012
Volumen: 483
Materias:
Palabras Clave Informales: Proximity effects; Weak links; Tunneling phenomena; Josephson effects
Escuela: E.T.S. Arquitectura (UPM)
Departamento: Física e Instalaciones Aplicadas a la Edificación, al Medio Ambiente y al Urbanismo [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

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.

Más información

ID de Registro: 16167
Identificador DC: http://oa.upm.es/16167/
Identificador OAI: oai:oa.upm.es:16167
URL Oficial: http://www.journals.elsevier.com/physica-c-superconductivity-and-its-applications/
Depositado por: Memoria Investigacion
Depositado el: 02 Oct 2013 18:54
Ultima Modificación: 21 Abr 2016 16:29
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