{"id":10432,"date":"1996-01-01T00:00:00","date_gmt":"1996-01-01T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/1996\/01\/01\/estudio-del-efecto-de-la-granularidad-sobre-las-corrientes-criticas-y-las-curvas-caracteristicas-vi-en-los-superconductores-de-oxido-de-cobre-policristalinos\/"},"modified":"1996-01-01T00:00:00","modified_gmt":"1996-01-01T00:00:00","slug":"estudio-del-efecto-de-la-granularidad-sobre-las-corrientes-criticas-y-las-curvas-caracteristicas-vi-en-los-superconductores-de-oxido-de-cobre-policristalinos","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/estudio-del-efecto-de-la-granularidad-sobre-las-corrientes-criticas-y-las-curvas-caracteristicas-vi-en-los-superconductores-de-oxido-de-cobre-policristalinos\/","title":{"rendered":"Estudio del efecto de la granularidad sobre las corrientes criticas y las curvas caracteristicas vi en los superconductores de oxido de cobre policristalinos."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Andres Diaz Pazos <\/strong><\/h2>\n<p>En esta tesis se estudia, desde un punto de vista experimental, los efectos de la granularidad en muestras ceramicas de superconductores de alta temperatura sobre varias magnitudes fisicas: resistividad en estado normal, resistividad paracoherente (parte lineal de las curvas voltaje-intensidad), corrientes criticas y campo caracteristico de penetracion intergranular ho (extraido con la ayuda de los modelos de estado critico). Para ello se propone previamente un modelo fenomenologico sencillo que permite separar las contribuciones a la resistividad normal y paracoherente de las fronteras de grano, intergrano, anisotropia y defectos estructurales.  posteriormente se describen los dispositivos experimentales necesarios para la realizacion de las medidas, algunos de los cuales fueron dise\u00f1ados especialmente para esta tesis, y se presentan los resultados experimentales mas sobresalientes. En el ultimo capitulo de la tesis el modelo propuesto es verificado de forma experimental, mostrandose despues, tambien de forma experimental, que la resistividad media de las uniones debiles intergranulares en estado normal es un parametro que controla de forma fundamental las magnitudes citadas.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Estudio del efecto de la granularidad sobre las corrientes criticas y las curvas caracteristicas vi en los superconductores de oxido de cobre policristalinos.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Estudio del efecto de la granularidad sobre las corrientes criticas y las curvas caracteristicas vi en los superconductores de oxido de cobre policristalinos. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Andres Diaz Pazos <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Santiago de compostela<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 01\/01\/1996<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Jes\u00fas Maza Frechin<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Vicente P\u00e9rez Villar <\/li>\n<li>Yvan Simon (vocal)<\/li>\n<li>Josep Fontcuberta Gri\u00f1\u00f3 (vocal)<\/li>\n<li>Rafael Navarro Linares (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Andres Diaz Pazos En esta tesis se estudia, desde un punto de vista experimental, los efectos de [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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