{"id":96620,"date":"2018-03-11T10:16:52","date_gmt":"2018-03-11T10:16:52","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/first-order-magnetic-phase-transitions-in-strongly-correlated-electron-systems\/"},"modified":"2018-03-11T10:16:52","modified_gmt":"2018-03-11T10:16:52","slug":"first-order-magnetic-phase-transitions-in-strongly-correlated-electron-systems","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/quimica-fisica\/first-order-magnetic-phase-transitions-in-strongly-correlated-electron-systems\/","title":{"rendered":"First-order magnetic phase transitions in strongly correlated electron systems"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Marta Otero Leal <\/strong><\/h2>\n<p>El objetivo que nos planteamos al inicio de esta tesis era comprender la aparici\u00f3n de separaci\u00f3n de fases magn\u00e9ticas\/el\u00e9ctricas por encima de tc en manganitas d e Valencia mixta. Pronto nos dimos cuenta de que este efecto era m\u00e1s relevante en muestras \u00f3ptimamente dopadas (~1\/3 huecos) con una transici\u00f3n de mase magn\u00e9tica de primer orden en tc. Esto fue sorprendente y desafiante a la vez: sorprendente, porque normalmente una gran barrera energ\u00e9tica separa los estados de orden y desorden a ambos lados de una transici\u00f3n de fase de primer orden evitando la coexistencia de multifases: desafiante porque una transici\u00f3n de fase de primer orden ferromagn\u00e9tica-paramagn\u00e9tica es un fen\u00f3meno poco com\u00fan relacionado con el acoplamiento entre diferentes grados de libertad, complicando el tratamiento te\u00f3rico del problema. con este escenario, decidimos empezar un proyecto para estudiar el origen f\u00edsico de la transici\u00f3n de fase magn\u00e9tica de primer orden en manganitas, combinando t\u00e9cnicas de alta presi\u00f3n con dopajes qu\u00edmicos convencionales. Una sabia combinaci\u00f3n de estas dos maneras de ejercer presi\u00f3n en la estructura nos permitir\u00e1 dilucidar el origen microsc\u00f3pico de la transici\u00f3n de fase discontinua, m\u00e1s all\u00e1 de la comprensi\u00f3n termodin\u00e1mica del fen\u00f3meno. Nosotros estamos tambi\u00e9n interesados en verificar, cuantitativamente, las predicciones del modelo magn\u00e9tico inhomog\u00e9neo (estado vibr\u00f3nico) y la inevitable influencia del desorden qu\u00edmico. despu\u00e9s de esto, hemos decidido probar nuestros m\u00e9todos y nuestras hip\u00f3tesis en otros sistemas que ni est\u00e1n relacionados con las manganitas. Hemos probado en sistemas con momento itinerante, inspirados en la observaci\u00f3n de una transici\u00f3n de fase magn\u00e9tica de primer orden en mnsi. en los cap\u00edtulos de esta tesis se resumen las observaciones y los debates m\u00e1s relevantes para apoyar nuestras conclusiones.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>First-order magnetic phase transitions in strongly correlated electron systems<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 First-order magnetic phase transitions in strongly correlated electron systems <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Marta Otero Leal <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Santiago de compostela<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 16\/10\/2009<\/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>Jos\u00e9 Francisco Rivadulla Fernandez<\/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>Luis Brey abalo (vocal)<\/li>\n<li>Mar\u00eda antonia Se\u00f1ar\u00eds  rodr\u00edguez (vocal)<\/li>\n<li>rodolfo Sanchez (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Marta Otero Leal El objetivo que nos planteamos al inicio de esta tesis era comprender la aparici\u00f3n [&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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