{"id":105924,"date":"2018-03-11T10:29:38","date_gmt":"2018-03-11T10:29:38","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/magnetic-structure-and-dynamics-of-la0-7pb0-3mn1-xfexo3-compounds-studied-by-nuclear-techniques\/"},"modified":"2018-03-11T10:29:38","modified_gmt":"2018-03-11T10:29:38","slug":"magnetic-structure-and-dynamics-of-la0-7pb0-3mn1-xfexo3-compounds-studied-by-nuclear-techniques","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/propiedades-magneticas-de-los-solidos\/magnetic-structure-and-dynamics-of-la0-7pb0-3mn1-xfexo3-compounds-studied-by-nuclear-techniques\/","title":{"rendered":"Magnetic structure and dynamics of la0.7pb0.3(mn1-xfex)o3 compounds studied by nuclear techniques"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Pierpaolo Romano <\/strong><\/h2>\n<p>Compuestos de composici\u00f3n nominal  la0.7pb0.3(mn1xfex)o3 (0<x<0.2) y con estructura tipo perovskita han sido estudiados de forma exhaustiva mediante el uso de t\u00e9cnicas nucleares: neutrones y muones. La introducci\u00f3n progresiva de fe en substituci\u00f3n del mn da lugar a un cambio en la interacci\u00f3n magn\u00e9tica: desde el doble-canje (ferromagn\u00e9tico, fm) para la muestra con x=0 (sin fe), apareciendo interacciones de tipo antiferromagn\u00e9tico (af; x=0.1, 0.15)  hasta llegar al estado de cluster- o spin-glass de frustraci\u00f3n magn\u00e9tica que presenta la muestra con x=0.2 (20% de fe).  las t\u00e9cnicas nucleares con neutrones como la difracci\u00f3n de bajo \u00e1ngulo y el uso de neutrones polarizados han posibilitado obtener evidencia directa de la aparici\u00f3n de las interacciones af al introducir fe en la composici\u00f3n de las muestras. De los resultados obtenidos mediante el uso de neutrones polarizados tambi\u00e9n se observ\u00f3 la existencia de nano-entidades tanto fm como af no s\u00f3lo a bajas temperaturas, si no tambi\u00e9n a temperaturas altas donde los compuestos se encuentran en fase paramagn\u00e9tica (pm). La t\u00e9cnica de relajaci\u00f3n de spin con muones di\u00f3 una idea detallada del estado de spin-glass que presenta la muestra correspondiente a x=0.2. Finalmente, la t\u00e9cnica de spin-echo con neutrones dio una visi\u00f3n detallada en todas las composiciones sobre la din\u00e1mica de spin en estas entidades, obteni\u00e9ndose dos escalas de tiempos de relajaci\u00f3n que se adscriben a procesos f\u00edsicos de muy distinto origen.\n\n\n\n&nbsp;\n\n\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Magnetic structure and dynamics of la0.7pb0.3(mn1-xfex)o3 compounds studied by nuclear techniques<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Magnetic structure and dynamics of la0.7pb0.3(mn1-xfex)o3 compounds studied by nuclear techniques <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Pierpaolo Romano <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Pa\u00eds vasco\/euskal herriko unibertsitatea<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 17\/12\/2010<\/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>Francisco Javier Bermejo Barrera<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Jos\u00e9 manuel Barandiaran garcia <\/li>\n<li>blanca Hernando grande (vocal)<\/li>\n<li>Mar\u00eda  teresa Fernandez diaz (vocal)<\/li>\n<li>stephen Cottrell (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Pierpaolo Romano Compuestos de composici\u00f3n nominal la0.7pb0.3(mn1xfex)o3 (0<\/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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