{"id":7613,"date":"1995-01-01T00:00:00","date_gmt":"1995-01-01T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/1995\/01\/01\/preparacion-y-caracterizacion-de-capas-delgadas-superconductoras-de-bisrcacuo-crecidas-in-situ-por-ablacion-laser\/"},"modified":"1995-01-01T00:00:00","modified_gmt":"1995-01-01T00:00:00","slug":"preparacion-y-caracterizacion-de-capas-delgadas-superconductoras-de-bisrcacuo-crecidas-in-situ-por-ablacion-laser","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/preparacion-y-caracterizacion-de-capas-delgadas-superconductoras-de-bisrcacuo-crecidas-in-situ-por-ablacion-laser\/","title":{"rendered":"Preparacion y caracterizacion de capas delgadas superconductoras de bisrcacuo crecidas in situ por ablacion laser."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Domingo Martinez Garcia <\/strong><\/h2>\n<p>Se ha dise\u00f1ado y montado un equipo de ablacion laser para el crecimiento \u00abin situ\u00bb de capas delgadas superconductoras. Este equipo se ha aplicado al crecimiento del compuesto bisrcacuo (2212) sobre substratos de mgo. Determinadas las condiciones optimas (tsubstrato= 700 grados c y po2= 0.1-0.5 mbar), las capas crecen texturadas con el eje c perpendicular a la superficie del substrato, con una dispersion de 0.5 grados (rocking curves). La tecnica rbs permite analizar la textura, ademas de la composicion de las capas, habiendose medido porcentajes de canalizacion axial del orden del 70%. Se ha utilizado por primera vez la tecnica rbs, en modo de canalizacion planar, para medir relaciones de epitaxia capa-substrato, encontrandose dos relaciones a +- 13 grados. Los espectros de difraccion de rayos x en geometrias 0-20 se han analizado desarrollando un modelo de intercrecimiento de fases, que permite calcular el porcentaje de defectos de apilamiento. La aparicion de este tipo de defectos se ha relacionado con las desviaciones de estequiometria de las capas respecto de la composicion del material de partida. La caracterizacion del estado superconductor se ha realizado midiendo, en funcion de la temperatura, la resistencia electrica y la susceptibilidad magnetica. La temperatura de transicion superconductora de las capas cristalizadas in situ (tc = 20-40 k), parece estar limitada, fundamentalmente, por la presencia de los defectos de apilamiento cuya disminucion en los recocidos a alta temperatura produce un aumento notable de la mencionada temperatura (tc = 60-80 k).<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Preparacion y caracterizacion de capas delgadas superconductoras de bisrcacuo crecidas in situ por ablacion laser.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Preparacion y caracterizacion de capas delgadas superconductoras de bisrcacuo crecidas in situ por ablacion laser. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Domingo Martinez Garcia <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Universitat de val\u00e9ncia (estudi general)<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 01\/01\/1995<\/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>Alfredo Segura Garc\u00eda Del R\u00edo<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Daniel Beltran Porter <\/li>\n<li>Aurelio Climent Font (vocal)<\/li>\n<li>Jos\u00e9 Luis Morenza Gil (vocal)<\/li>\n<li>Eduardo Mart\u00ednez Tamayo (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Domingo Martinez Garcia Se ha dise\u00f1ado y montado un equipo de ablacion laser para el crecimiento \u00abin [&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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